Mez's Codes...

[seznam88]

you can create invincibility code for out of this world for SNES
thank you

[Mezmorize]

If you will, try some of the problematic codes with a different value used:
----------------------------------------
Hudson's Adventure Island (U) [!]
Powerups Are Worth More Points
ANXEKLEY
ESXEKLEY - This reduces points you get from fruits in bonus stages. It stills good though.

Points Continue Rising From Powerups Until You Move
AIOAOLEY
EIOAOLEY - Some fruits seems are noncollectable with this code.

Touching Obsticles And Enemies Kills Them
AYVGPAEY
EIVGPAEY - You must avoid touching every boss on end of every area #-4 or the game will not continue.
Also, it makes you to have a Fairy Bee invincibility, however, having a real Fairy Bee from an egg makes the player vulnerable to enemies.

-----------------------------------------
Hudson's Adventure Island II (U) [!]
Get 2,000 Points At Start Of Round
ANVXOZEP
EUVXOZEP - This works only if you doesn't have a dinosaur riding in beginning of the stage.

Automatically Run, Hold B To Walk
ANEZYAEY
ESEZYAEY - This works only if you doesn't have a dinosaur riding.

Hold Jump To Slowly Float, Let Go To Slowly Fall
AYOLIPEI
EYOLIPEI - Pterodactyl (the flying dinosaur) cannot fly with this code.

Invulnerability
ASXSUTEL
EOXSUTEL - You will die if try to collect a key for Island Skip Room / Secret Room / Bonus stages from an hidden egg.

-----------------------------------------
Hudson's Adventure Island III (U) [!]
Swim In The Air
ANEZPYEI
ENEZPYEI - You'll lose any dinosaur (except the purple swimming one) when using the code.

Touching Enemies Kills Them
AYKZNGEY
EIKZNGEY - Running into enemies while having an Invincibility bee will kill the player.

Touching Enemies Kills Them (Alt)
ANXZOGEY
ESXZOGEY - Touching an enemy while having a dinosaur causes an instant death.

-----------------
Megaman IV (U) (PRG0) [!]
Takes Less Shots To Kill Enemies
ASNEAZEY
ESNEAZEY - Firing a full charget Megabuster shot takes a less damage to bosses (Tested on Bright Man)

-------------------------------------------------------------------
Megaman VI (U) [!]
The Longer You Hold Jump, The Higher You Go
ANSEGTEI
ENSEGTEI - Can't jump higher underwater (tested on Centaur Man's stage).

[Unicode]

Finished with your request for the Megaman series, Castlevania will be next.

The following are for Megaman VI (U) [!] and were created on Blizzard Man stage.

No Music
APXETYAL - Nice

No Sound Effects
ELXAPYEP - Nice

No Sound Effects (Alt)
EINAIAEY

No Audio
ELEEAPEP - Music stills play when you're not shooting.

Fight The Stage Boss
ELKAYPEP
Note: Turn the code on after the stage has loaded. - Nice

Warp To The Last Stage
EIVGSIEY
Note: Turn the code off to stop it from looping. - But it make start without any weapons or rush.

Automatically Shoot
ELKAATEP - Can't climb ladders with this code

Invulnerability
EUKEOTEP
Note: Can't stand on the timer bombs or pick up items.

Invulnerability
ESXAKTEY - Already made by @Abystus.

Invulnerability (Alt)
EYNAKYEI - Useful

Invulnerability (Alt 2)
EYNEEYEI - Useful

Randomly Shoot Charged Shots
ANXAZTEP - Nice

No Enemies Or Powerups
EIUETPEY

No Enemies Or Powerups (Alt)
EOKAYPEL

Stage Colors Change After Shooting Once
ESNVOLEY

Auto Shoot When Standing
EYUKGYEI - Useless. Makes shooting enemies more difficult.

Automatically Shoot
EYUAATEI - Cannot climb ladders with this code.

Don't Slide On Ice
AIOANLEI - Useful

Auto Charge Up Shots
EYUATTEI - Useful

The Longer You Hold Jump, The Higher You Go
ENSEGTEI - Can't jump higher underwater (tested on Centaur Man's stage).

Megaman Changes To Red After Shooting Once
EYNAATEI

Walrus Enemies Face Away From You
AOKVAIAL - This applies for other enemies and bosses too. It actually makes fights with bosses easier. Please rename the code name to "Enemies Face Away From You".

Walrus Enemies Can't Shoot
AOSPEGAL - Useful

One Hit Kills Walrus Enemies
ALOVKLAP

One Hit Kills
EOEPIAEL - Doesn't work on bosses and some enemies (tested on Wind Man).

No Walrus Enemies
EOKTOZEL - It removes some other enemies too.

Enemies Can't Shoot Some Projectiles
EPNTKZEL - Useful
Enemies Can't Shoot
EOXVTIEL - This code makes the machines dropping Metools in Tomahawk Man's stage look glitchly after being destroyed. Also disables items (Health / Weapons capsules, Extra Lives, E-Tanks) dropped by Eddie too.

Enemies Can't Shoot (Alt)
EYEVXTEI - No effect - enemies still can shoot.

Enemies Drop Large Health Spheres
ELVGKGEP

Don't Get Knocked Back From Taking Damage
EYOEAIEI

Increased Drop Rate Upon Enemy Death
ENNAGPEI

Thanks. I added proper codes for Mega Man 6 and "Rainbow beam" type codes for Mega Man 4 noted by you early.

Only one warning about Castlevania games: the first Castlevania game have a two versions - PRG0 and PRG1, as a code working on the one version of the game probably won't work on the other.

[Mezmorize]

Finished with your request for the Megaman series, Castlevania will be next.

The following are for Megaman VI (U) [!] and were created on Blizzard Man stage.

No Music
APXETYAL

No Sound Effects
ELXAPYEP

No Sound Effects (Alt)
EINAIAEY

No Audio
ELEEAPEP

Fight The Stage Boss
ELKAYPEP
Note: Turn the code on after the stage has loaded.

Warp To The Last Stage
EIVGSIEY
Note: Turn the code off to stop it from looping.

Automatically Shoot
ELKAATEP

Invulnerability
EUKEOTEP
Note: Can't stand on the timer bombs or pick up items.

Invulnerability
ESXAKTEY

Invulnerability (Alt)
EYNAKYEI

Invulnerability (Alt 2)
EYNEEYEI

Randomly Shoot Charged Shots
ANXAZTEP

No Enemies Or Powerups
EIUETPEY

No Enemies Or Powerups (Alt)
EOKAYPEL

Stage Colors Change After Shooting Once
ESNVOLEY

Auto Shoot When Standing
EYUKGYEI

Automatically Shoot
EYUAATEI

Don't Slide On Ice
AIOANLEI

Auto Charge Up Shots
EYUATTEI

The Longer You Hold Jump, The Higher You Go
ENSEGTEI

Megaman Changes To Red After Shooting Once
EYNAATEI

Walrus Enemies Face Away From You
AOKVAIAL

Walrus Enemies Can't Shoot
AOSPEGAL

One Hit Kills Walrus Enemies
ALOVKLAP

One Hit Kills
EOEPIAEL

No Walrus Enemies
EOKTOZEL

Enemies Can't Shoot Some Projectiles
EPNTKZEL

Enemies Can't Shoot
EOXVTIEL

Enemies Can't Shoot (Alt)
EYEVXTEI

Enemies Drop Large Health Spheres
ELVGKGEP

Don't Get Knocked Back From Taking Damage
EYOEAIEI

Increased Drop Rate Upon Enemy Death
ENNAGPEI

[Mezmorize]

Thanks for all the testing Unicode.
Here's codes for Megaman 4, created on Ring Man stage, only went to another stage to test out invincibility on spikes.
Enemies are the cannons, and 'color beams' are the things you see at the beginning of Ring Man stage.

Megaman IV (U) (PRG0) [!]

Enemies Shoot In The Opposite Direction
EPXNAYEL

Enemies Shoot Backwards
EPUNYYEL

Enemies Don't Shoot In Some Angles
EPVYAYEL

Enemies Don't Shoot In Some Angles (Alt)
EPVYYYEL

Enemies Shoot Differently
EOUNTYEL

Since these do work for the cannon enemies on Ring Man stage, you could just rename the code.

Color Beams Do Not Move When Standing On Them
ALXXTAAP

Color Beams Do Not Move When Standing On Them (Alt)
EOXNUPEL

Color Beams Do Not Move When Standing On Them (Alt 2)
EPXZYAEL

Color Beams Do Not Move When Standing On Them (Alt 3)
EIOZAPEY

Color Beams Do Not Move When Standing On Them (Alt 4)
ENEYOPEI

I'm curious to why you tagged these as useless, they make the Ring Man stage much easier since you don't have to worry about falling thru them.

[Unicode]

Thanks for all the testing Unicode.
Here's codes for Megaman 4, created on Ring Man stage, only went to another stage to test out invincibility on spikes.
Enemies are the cannons, and 'color beams' are the things you see at the beginning of Ring Man stage.

Megaman IV (U) (PRG0) [!]
No Music
APXEYYAL - Nice

No Music (Alt)
ESOEILEY - If I activate this code while game is playing, music starts to sound frozen.

No Sound Effects
ELXAZYEP - Nice

No Sound Effects (Alt)
EISAGZEY - Nice

No Audio
ESUEGIEY - Doesn't disable music completely.

No Audio (Alt)
EYSNVYEI - Make music looping, but it stills plays.

Hyper Speed Music
AUVEALAP - Nice

Backgrounds Change Colors
AOOLOAAL

Foregrounds Change Colors
ALOUEAAP

Color Beams Are Harder To Walk Across
AOSXLAAL

Color Beams Are Easier To Walk Across
EOONOPEL

Color Beams Do Not Move When Standing On Them
ALXXTAAP

Color Beams Do Not Move When Standing On Them (Alt)
EOXNUPEL

Color Beams Do Not Move When Standing On Them (Alt 2)
EPXZYAEL

Color Beams Do Not Move When Standing On Them (Alt 3)
EIOZAPEY

Color Beams Do Not Move When Standing On Them (Alt 4)
ENEYOPEI

Color Beams Move When Not Standing On Them
EPOXTAEL

Invulnerability
AUUAIPAP
Note: Spikes still kill you. - Useful

Invulnerability (Alt)
ENUEPPEI
Note: Spikes still kill you. - Useful

Invulnerability
ESSAPAEY - Useful

Enemies Shoot In The Opposite Direction
EPXNAYEL

Enemies Shoot Backwards
EPUNYYEL

Enemies Don't Shoot In Some Angles
EPVYAYEL

Enemies Don't Shoot In Some Angles (Alt)
EPVYYYEL

Enemies Shoot Differently
EOUNTYEL - I can't get any of these codes working (tested on Drill Man's and Bright Man's stages)

Fall Down Faster
EPOYYLEL

Enemies Don't Shoot
EPUOEAEL

Enemies Don't Shoot (Alt)
EIXOOAEY - These two does nothing. On both versions of the game PRG0 and PRG1 enemies stills can shoot.

Enemies Don't Shoot (Alt 2)
EYNYVLEI - Useful. It's the only one I got working.

Stage Backgrounds Are Dark
EIXVGGEY - Nice, though it makes game harder for playing.

Can Keep Climbing Ladders After Reaching The Top
ESNIGGEY

Can Keep Climbing Ladders After Reaching The Top (Alt)
ENKIGGEI

Can Keep Climbing Ladders After Reaching The Top (Alt 2)
APSETGAL

Automatically Shoot
EIUAUIEY
Note: Turn off to climb ladders. - Useful

Automatically Shoot
EUNAKGEP - Doesn't let to climb ladders.

Automatically Grab Ladders
EIXOYZEY

Enemy Shots Travel Horizontally
EIUNPGEY

Enemies Can't Shoot Downward
EIUNIGEY

Slow Motion
ENNKTAEI - Useful

Walk Behind Backgrounds
ENNGYTEI - Nice

Enemies Only Shoot Up
ENXPNAEI

Enemies Only Shoot Down
ENUOEAEI

The Longer You Hold Jump, The Higher You Go
EYSNAPEI - Useful

Enemies Shoots Less Bullets
ENEPOAEI

Hit Almost Anywhere
EOXNSZEL - Useful

One Hit Kills
EPUALLEL - Useful

Shoot A Normal And Charged Shot At The Same Time
EUOAGAEP - Useful

Shoot Backwards
ESEESIEY

One Shot Can Kill Multiple Enemies
ESUEIZEY - You can't kill some enemies with this.

One Shot Can Kill Multiple Enemies (And Takes Less Shots)
ESNAGZEY - Useful


Takes Less Shots To Kill Enemies
ESNEAZEY - Firing a full charget Megabuster shot takes a less damage to bosses (Tested on Bright Man)

Takes Less Shots To Kill Enemies (Alt)
ENNEGZEI - Useful

--------------------------------------------------------------------
Megaman V (U) [!]
Created on Stone Man stage:

No Music
APXEYYAL - Nice

Hyper Music
AUVEALAP

No Sound Effects
ALXAZYEP - Not working at all.

No Sound Effects (Alt)
ELUAIPEP - Nice

Mostly No Audio
ELEEAPEP - This code actually disables audio completely.

Backgrounds Change Colors
AUEINLAP

You And Enemies Fall Faster
EOSTKPEL

Fall Faster
EUSVTYEP

Auto Shoot
ELXPGPEP - Can't climb ladders.

Auto Shoot (Alt)
ESVPYAEY - Useless

Stages Are Colored Differently, With No Enemies
EUVPEAEP - Useless

Slow Motion
EISGZYEY - Useful

No Walking Animation
ESEELPEY - Nice

Invulnerability (Can't Pick Up Items)
AUEVUYAP

Invulnerability (But Can't Kill Most Enemies)
ESNVAAEY - Useless

Invulnerability
ASEAIAAP
Note: Spikes still kill you. - Doesn't let to use some platforms - you take damage from them and you'll fall into pits.

Invulnerability (Alt)
ESKATZEY
Note: Spikes still kill you. - Useful

Invulnerability (Alt 2)
ENEEZAEI
Note: Spikes still kill you. - Useful

Invulnerability (Alt 3)
ENKEGZEI
Note: Spikes still kill you. - Useful

Debug Mode Showing
EIXSVYEY

After Jumping, You Stay In The Air
EYXTVAEI
Note: To fall back down, turn off the code. - Applies for enemies and bosses too.

The Longer You Hold Jump, The Higher You Go
ANVOPTEI - Useful

Automatically Charge Up For Stronger Shots
EYOOTPEI - Useful

No Enemies
ENOONAEI

No Enemies (Alt)
EPOPOPEL

No Enemies (Alt 2)
EOXPVPEL

No Enemies (Alt 3)
EUVOOAEP

Hyper Character/Enemy Animations
ENSVAAEI - Bad code.

Enemies Don't Pop Out Of The Ground
EOXTUGEL

Enemies Don't Pop Out Of The Ground (Alt)
EPNVSGEL

Enemies Automatically Die As You Aproach
EPNATAEL
Note: An annoying sound effect will often play though. - Useful

Hit Almost Anywhere
EPKNTAEL - Doesn't work well.

Enemies That Pop Out Of The Ground Shoot 2 Bullets Instead Of 3
EPSVSPEL

Enemies That Pop Out Of The Ground Don't Shoot
EPNXYPEL

Enemies That Pop Out Of The Ground Don't Turn Into 3 Smaller Enemies When Shot
EPEXIPEL

Enemies That Pop Out Of The Ground Don't Turn Into 3 Smaller Enemies When Shot (Alt)
ENXZYPEI

Enemies That Pop Out Of The Ground Shoot Away From You
ELXVEGEP

Enemies That Pop Out Of The Ground's 3 Miniture Versions Don't Move Horizontally
EUUXYPEP

Enemies That Pop Out Of The Ground's 3 Miniture Versions Don't Move Horizontally (Alt)
ESUXAPEY

Normal Shots Are Charged, Charged Shots Are Normal
EUKOZPEP

Enemies Drop Large Blue Bars
EUEZVTEP

Enemies Drop Large Blue Bars (Alt)
EYOYPZEI

Reverse The Function Of The Left And Right Buttons
EIKVOZEY - Useless

Shoot Backwards
ESUOTPEY

You And Enemies Shoot Backwards
EIVVVZEY

Backgrounds Flash After You Receive Damage
EIETZPEY - It also flashes when you shoot an enemy.

One Shot Can Kill Multiple Enemies
ESVATPEY - Useful

One Shot Can Kill Multiple Enemies (Alt)
ESVEZPEY - Useful

After Killing An Enemy, Your Bullet Travels Diagonally
ESNAPPEY

Your Bullets Travel Lower And Faster
EYOOAZEI - Nice

Shoot Once, And A Charged Shot Follows
EYKOTPEI - Useful

Get Knocked Forwards Instead Of Backwards From Taking Damage
ENOATGEI

Tested and added proper codes.

[Mezmorize]

Thanks for all the testing Unicode.
Here's codes for Megaman 4, created on Ring Man stage, only went to another stage to test out invincibility on spikes.
Enemies are the cannons, and 'color beams' are the things you see at the beginning of Ring Man stage.

Megaman IV (U) (PRG0) [!]
No Music
APXEYYAL

No Music (Alt)
ESOEILEY

No Sound Effects
ELXAZYEP

No Sound Effects (Alt)
EISAGZEY

No Audio
ESUEGIEY

No Audio (Alt)
EYSNVYEI

Hyper Speed Music
AUVEALAP

Backgrounds Change Colors
AOOLOAAL

Foregrounds Change Colors
ALOUEAAP

Color Beams Are Harder To Walk Across
AOSXLAAL

Color Beams Are Easier To Walk Across
EOONOPEL

Color Beams Do Not Move When Standing On Them
ALXXTAAP

Color Beams Do Not Move When Standing On Them (Alt)
EOXNUPEL

Color Beams Do Not Move When Standing On Them (Alt 2)
EPXZYAEL

Color Beams Do Not Move When Standing On Them (Alt 3)
EIOZAPEY

Color Beams Do Not Move When Standing On Them (Alt 4)
ENEYOPEI

Color Beams Move When Not Standing On Them
EPOXTAEL

Invulnerability
AUUAIPAP
Note: Spikes still kill you.

Invulnerability (Alt)
ENUEPPEI
Note: Spikes still kill you.

Invulnerability
ESSAPAEY

Enemies Shoot In The Opposite Direction
EPXNAYEL

Enemies Shoot Backwards
EPUNYYEL

Enemies Don't Shoot In Some Angles
EPVYAYEL

Enemies Don't Shoot In Some Angles (Alt)
EPVYYYEL

Enemies Shoot Differently
EOUNTYEL

Fall Down Faster
EPOYYLEL

Enemies Don't Shoot
EPUOEAEL

Enemies Don't Shoot (Alt)
EIXOOAEY

Enemies Don't Shoot (Alt 2)
EYNYVLEI

Stage Backgrounds Are Dark
EIXVGGEY

Can Keep Climbing Ladders After Reaching The Top
ESNIGGEY

Can Keep Climbing Ladders After Reaching The Top (Alt)
ENKIGGEI

Can Keep Climbing Ladders After Reaching The Top (Alt 2)
APSETGAL

Automatically Shoot
EIUAUIEY
Note: Turn off to climb ladders.

Automatically Shoot
EUNAKGEP

Automatically Grab Ladders
EIXOYZEY

Enemy Shots Travel Horizontally
EIUNPGEY

Enemies Can't Shoot Downward
EIUNIGEY

Slow Motion
ENNKTAEI

Walk Behind Backgrounds
ENNGYTEI

Enemies Only Shoot Up
ENXPNAEI

Enemies Only Shoot Down
ENUOEAEI

The Longer You Hold Jump, The Higher You Go
EYSNAPEI

Enemies Shoots Less Bullets
ENEPOAEI

Hit Almost Anywhere
EOXNSZEL

One Hit Kills
EPUALLEL

Shoot A Normal And Charged Shot At The Same Time
EUOAGAEP

Shoot Backwards
ESEESIEY

One Shot Can Kill Multiple Enemies
ESUEIZEY

One Shot Can Kill Multiple Enemies (And Takes Less Shots)
ESNAGZEY

Takes Less Shots To Kill Enemies
ESNEAZEY

Takes Less Shots To Kill Enemies (Alt)
ENNEGZEI

--------------------------------------------------------------------
Megaman V (U) [!]
Created on Stone Man stage:

No Music
APXEYYAL

Hyper Music
AUVEALAP

No Sound Effects
ALXAZYEP

No Sound Effects (Alt)
ELUAIPEP

Mostly No Audio
ELEEAPEP

Backgrounds Change Colors
AUEINLAP

You And Enemies Fall Faster
EOSTKPEL

Fall Faster
EUSVTYEP

Auto Shoot
ELXPGPEP

Auto Shoot (Alt)
ESVPYAEY

Stages Are Colored Differently, With No Enemies
EUVPEAEP

Slow Motion
EISGZYEY

No Walking Animation
ESEELPEY

Invulnerability (Can't Pick Up Items)
AUEVUYAP

Invulnerability (But Can't Kill Most Enemies)
ESNVAAEY

Invulnerability
ASEAIAAP
Note: Spikes still kill you.

Invulnerability (Alt)
ESKATZEY
Note: Spikes still kill you.

Invulnerability (Alt 2)
ENEEZAEI
Note: Spikes still kill you.

Invulnerability (Alt 3)
ENKEGZEI
Note: Spikes still kill you.

Debug Mode Showing
EIXSVYEY

After Jumping, You Stay In The Air
EYXTVAEI
Note: To fall back down, turn off the code.

The Longer You Hold Jump, The Higher You Go
ANVOPTEI

Automatically Charge Up For Stronger Shots
EYOOTPEI

No Enemies
ENOONAEI

No Enemies (Alt)
EPOPOPEL

No Enemies (Alt 2)
EOXPVPEL

No Enemies (Alt 3)
EUVOOAEP

Hyper Character/Enemy Animations
ENSVAAEI

Enemies Don't Pop Out Of The Ground
EOXTUGEL

Enemies Don't Pop Out Of The Ground (Alt)
EPNVSGEL

Enemies Automatically Die As You Aproach
EPNATAEL
Note: An annoying sound effect will often play though.

Hit Almost Anywhere
EPKNTAEL

Enemies That Pop Out Of The Ground Shoot 2 Bullets Instead Of 3
EPSVSPEL

Enemies That Pop Out Of The Ground Don't Shoot
EPNXYPEL

Enemies That Pop Out Of The Ground Don't Turn Into 3 Smaller Enemies When Shot
EPEXIPEL

Enemies That Pop Out Of The Ground Don't Turn Into 3 Smaller Enemies When Shot (Alt)
ENXZYPEI

Enemies That Pop Out Of The Ground Shoot Away From You
ELXVEGEP

Enemies That Pop Out Of The Ground's 3 Miniture Versions Don't Move Horizontally
EUUXYPEP

Enemies That Pop Out Of The Ground's 3 Miniture Versions Don't Move Horizontally (Alt)
ESUXAPEY

Normal Shots Are Charged, Charged Shots Are Normal
EUKOZPEP

Enemies Drop Large Blue Bars
EUEZVTEP

Enemies Drop Large Blue Bars (Alt)
EYOYPZEI

Reverse The Function Of The Left And Right Buttons
EIKVOZEY

Shoot Backwards
ESUOTPEY

You And Enemies Shoot Backwards
EIVVVZEY

Backgrounds Flash After You Recieve Damage
EIETZPEY

One Shot Can Kill Multiple Enemies
ESVATPEY

One Shot Can Kill Multiple Enemies (Alt)
ESVEZPEY

After Killing An Enemy, Your Bullet Travels Diagonally
ESNAPPEY

Your Bullets Travel Lower And Faster
EYOOAZEI

Shoot Once, And A Charged Shot Follows
EYKOTPEI

Get Knocked Forwards Instead Of Backwards From Taking Damage
ENOATGEI

[Unicode]

Megaman III (U) [!]

No Music
APXEYYAL

No Sound Effects
ELXAZYEP - It removes only music, but not sounds effects.

No Audio
ELEEAPEP - Nice

No Audio (Alt)
ENXYKAEI - Turning off codes restores only sounds, but for restoring music you have to restart game.

Slow Decent When Falling
ESVNGYEY - Nice

Slow Decent When Falling
APESZAAL
Note: Hold the jump button to fall at regular speed. - Useful

Faster Decent When Falling
EPEYNAEL

No Enemies
ALKNEGAP

No Enemies (Alt)
EOOPEGEL

No Enemies (Alt 2)
ELSPVGEP

No Enemies (Alt 3)
ESEPVGEY - All "No Enemies" codes removes power-ups (Health and Weapon capsules / Extra Lives / Energy tanks) placed into levels, bosses (can't finish stages) and Protoman (you can't even get past places where you need to to fight him to advance).

Invulnerability (Can't Pick Up Items)
AUNYEZAP

Invulnerability
ESUAGAEY - Useful

Invulnerability (Alt)
EISKKIEY - Useful. Best code because it also makes Megaman invincible against spikes.

Invulnerability (Alt 2)
ESOEGAEY - Useful

Invulnerability (Alt 3)
ESUAGAEY - It is the same as "Invulnerability" code.

Some Enemies Can't Move
EOXULGEL - I can't got this code to do anything (tested on Needle Man's and Gemini Man's stages and all enemies stills move).

The Longer You Hold Jump, The Higher You Go
EIKGOLEY - Nice

The Longer You Hold Jump, The Higher You Go (Alt)
EYUIAAEI - Useful. It gives you slower falling after jumping.

The Longer You Hold Jump, The Higher You Go (Alt 2)
ENUGOTEI - Nice

Automatically Grab Ladders After Jumping Under Them
ESEIYGEY - Doesn't let Megaman to climb ladders down.

Megaman Is Outlined In White
EYNKAAEI - Doesn't change Mega Man's sprite look, but messes up intro and stage select screen.

Instantly Beat Stage?
EYKKVLEI

Start On Last Stage?
EYSGVLEI
Note: Turn the code off to make it stop looping. - Nice

Visually Walk Behind Backgrounds
EYOYZYEI - Nice

Backgrounds Don't Animate
EYSEYIEI - Nice

Hit Anywhere
EOVNNLEL - Useful

One Hit Kills
EOKEPPEL - Useful

One Hit Kills (Alt)
EIUALZEY - Doesn't work on bosses (tested on Needle Man's stage boss).

Extra Lives Drop From Enemy Kills
ELNLXYEP - Useful

Extra Lives Drop From Enemy Kills (Alt)
ENNYSGEI - Useful

Shoot Backwards
ESKETIEY

Automatically Shoot When Jumping
ESSILAEY - Nice

Press Up To Climb Walls
ESOILGEY

Press Up To Climb Walls (Alt)
ESOIYGEY

Press Up To Climb Walls (Alt 2)
ESOSIGEY - All three "Press Up To Climb Walls" doesn't let to press Down + A to make Mega Man to slide, which might be problem on narrow passages where you need exactly sliding to pass these areas.

Can Keep Climbing Ladders After Reaching The Top
ESESZIEY

Can Keep Climbing Ladders After Reaching The Top (Alt)
ESESTIEY

Automatically Climb Ladders
EYOILIEI

Hold B For Rapid-Fire
ENEGUIEI - Useful

Kill One Enemy To Beat The Stage
EYSELZEI - Totally bad. I got stuck on Sparkman's Doc stage.

Created on Spark Man stage.

I didn't have time to test all codes. Will continue testing later.

[Mezmorize]

Megaman III (U) [!]

No Music
APXEYYAL

No Sound Effects
ELXAZYEP

No Audio
ELEEAPEP

No Audio (Alt)
ENXYKAEI

Slow Decent When Falling
ESVNGYEY

Slow Decent When Falling
APESZAAL
Note: Hold the jump button to fall at regular speed.

Faster Decent When Falling
EPEYNAEL

No Enemies
ALKNEGAP

No Enemies (Alt)
EOOPEGEL

No Enemies (Alt 2)
ELSPVGEP

No Enemies (Alt 3)
ESEPVGEY

Invulnerability (Can't Pick Up Items)
AUNYEZAP

Invulnerability
ESUAGAEY

Invulnerability (Alt)
EISKKIEY

Invulnerability (Alt 2)
ESOEGAEY

Invulnerability (Alt 3)
ESUAGAEY

Some Enemies Can't Move
EOXULGEL

The Longer You Hold Jump, The Higher You Go
EIKGOLEY

The Longer You Hold Jump, The Higher You Go (Alt)
EYUIAAEI

The Longer You Hold Jump, The Higher You Go (Alt 2)
ENUGOTEI

Automatically Grab Ladders After Jumping Under Them
ESEIYGEY

Megaman Is Outlined In White
EYNKAAEI

Instantly Beat Stage?
EYKKVLEI

Start On Last Stage?
EYSGVLEI
Note: Turn the code off to make it stop looping.

Visually Walk Behind Backgrounds
EYOYZYEI

Backgrounds Don't Animate
EYSEYIEI

Hit Anywhere
EOVNNLEL

One Hit Kills
EOKEPPEL

One Hit Kills (Alt)
EIUALZEY

Extra Lives Drop From Enemy Kills
ELNLXYEP

Extra Lives Drop From Enemy Kills (Alt)
ENNYSGEI

Shoot Backwards
ESKETIEY

Automatically Shoot When Jumping
ESSILAEY

Press Up To Climb Walls
ESOILGEY

Press Up To Climb Walls (Alt)
ESOIYGEY

Press Up To Climb Walls (Alt 2)
ESOSIGEY

Can Keep Climbing Ladders After Reaching The Top
ESESZIEY

Can Keep Climbing Ladders After Reaching The Top (Alt)
ESESTIEY

Automatically Climb Ladders
EYOILIEI

Hold B For Rapid-Fire
ENEGUIEI

Kill One Enemy To Beat The Stage
EYSELZEI

Created on Spark Man stage.

[Unicode]

Here's more untested codes for you to try Unicode:

Megaman II (U) [!]
No Enemies (Some Stages)
EPSNIPEL

No Enemies
ALKSEZAP - This codes removes a power-ups placed in levels too.

No Enemies (Alt)
ALKSUZAP - Removes only some enemies, but removes a some power-ups too. Bosses still appears. (Tested on Metal Man's stage.)

No Enemies (Alt 2)
EOSPTTEL

More Enemies
ALONGAAP - Nice

More Enemies (Alt)
APXYLAAL - It removes some enemies from some areas from every stage.

Invincible After One Hit
EPUGXTEL - After while you still can get hit by enemies.

Faster Enemies
EPOKSYEL

Enemies Move Away From You
EOXYAPEL - Doesn't seem to do anything.

Enemies Move Away From You (Vertically)
ELKYLZEP - Useful. Far better than first code.

Enemies Move Differently
EOKYLPEL - Nice

Enemies Come After You More Aggressively
EOKNIPEL - Nice. Makes the game harder.

Enemies Stop When Far From You
EPSVEYEL - This code has a weird glitch - sometimes Mega Buster's shots doesn't travel, and instead stays on one place.

After Jumping, You Fall Down Faster
EPOEUGEL - Useless

After Jumping, You Fall Down Slower (And Can Walk In Air)
EPKAEGEL - Useful. Can't stay on moving platforms normally, though. It should be used with Invincibility to avoid instant death from Laser Beams in Quick Man's stage since you you can't escape from them quickly with this code.

Enemies Automatically Die
EUSTSTEP - Nice, though it doesn't work on all enemies.

Invulnerability
EIUGVTEY - This code already made by @Abystus.

Invulnerability (Alt)
ESKVETEY - You can still take damage from bosses.

Invulnerability (Alt 2)
ENOVAIEI - This make player dies in one hit in boss battles.

Enemies In Some Stages Can't Move
EIVPIZEY

Enemies Fall Straight Down
EIEVVYEY

Walk Backwards
EIUEOPEY

You And Enemies Attack Backwards
EYXTVYEI

Skip READY Dialog At Beginning Of Stage
EYSAIPEI - Useful

Invisible
EYKGSTEI - Useless. You can't climb ladders easy with this code.

No Sound Effects
EYOALAEI - It removes audio completely.

No Audio
EYXAZAEI - Nice

Bubbles Come Out Of Megaman
ENKAOZEI

Stop On The Top Of A Ladder To Fall Down It
APNAVLAL

Hit Anywhere Horizontally
EPXTPTEL - Makes some bosses harder to kill.

One Bullet Can Kill Multiple Enemies
EINIEZEY - Useful

Dropped Items From Enemies Float
ESSUSGEY - Nice

Instantly Climb Ladders
ENVATTEI

These were made in the Crashman stage.
I only tried a couple codes in other stages, such as no enemies and noticed it's not for all stages.

Tested and I got some of these.

[Mezmorize]

Here's more untested codes for you to try Unicode:

Megaman II (U) [!]
No Enemies (Some Stages)
EPSNIPEL

No Enemies
ALKSEZAP

No Enemies (Alt)
ALKSUZAP

No Enemies (Alt 2)
EOSPTTEL

More Enemies
ALONGAAP

More Enemies (Alt)
APXYLAAL

Invincible After One Hit
EPUGXTEL

Faster Enemies
EPOKSYEL

Enemies Move Away From You
EOXYAPEL

Enemies Move Away From You (Vertically)
ELKYLZEP

Enemies Move Differently
EOKYLPEL

Enemies Come After You More Aggressivly
EOKNIPEL

Enemies Stop When Far From You
EPSVEYEL

After Jumping, You Fall Down Faster
EPOEUGEL

After Jumping, You Fall Down Slower (And Can Walk In Air)
EPKAEGEL

Enemies Automatically Die
EUSTSTEP

Invulnerability
EIUGVTEY

Invulnerability (Alt)
ESKVETEY

Invulnerability (Alt 2)
ENOVAIEI

Enemies In Some Stages Can't Move
EIVPIZEY

Enemies Fall Straight Down
EIEVVYEY

Walk Backwards
EIUEOPEY

You And Enemies Attack Backwards
EYXTVYEI

Skip READY Dialog At Beginning Of Stage
EYSAIPEI

Invisible
EYKGSTEI

No Sound Effects
EYOALAEI

No Audio
EYXAZAEI

Bubbles Come Out Of Megaman
ENKAOZEI

Stop On The Top Of A Ladder To Fall Down It
APNAVLAL

Hit Anywhere Horizontally
EPXTPTEL

One Bullet Can Kill Multiple Enemies
EINIEZEY

Dropped Items From Enemies Float
ESSUSGEY

Instantly Climb Ladders
ENVATTEI

These were made in the Crashman stage.
I only tried a couple codes in other stages, such as no enemies and noticed it's not for all stages.

[Unicode]

I might re-visit them later on, but I've already started on Megaman.
Just like the previous games I only tested these for a couple seconds at a time.

Megaman (U) [!]
No Music (Only Sound Effects)
ELNPLZEP - Nice

No Audio
EINKLGEY - Nice

Remove Health Bar and Score
APNIZLAL - Nice

No Enemies
AOSIEPAL - Nice. It doesn't affects bosses, but removes all power-ups placed in levels, like Energy / Health capsules and Extra Lives and removes lifts on Gutman's stage making passing the level impossible.

No Enemies (Alt)
ESOSEAEY - It causes a massive glitches when boss battle begins and it also removes powerups placed throughout the levels. It also removes the lifts needed for progress some stages of the game (tested on Gutman's stage).

Walk Thru Walls
ASOSTYAP - It works only for breakable blocks.

Walk Thru Walls (Alt)
ASUKSIEL - It works only for breakable blocks.

Walk Thru Walls (Alt 2)
ESOKUIEY - Causes a strange walking through walls and you can't advance (tested on Cutman's stage).

Walk Thru Walls (Right Direction)
EIEOETEY
Note: Enemies can't pass thru walls walking right. - This code totally messes up graphic and entire stage.

Walk Thru Walls (Left Direction)
ESEPVTEY
Note: Enemies can't pass thru walls walking left. - This code totally messes up graphic and entire stage.

Some Enemies Move Away From You Instead Of Towards
ELSYPTEP

Some Enemies Move Away From You Instead Of Towards (Alt)
EIVUETEY

Some Enemies Fall Down Thru The Floor
EUXLOTEP - Nice

Walk Backwards
EIXPYIEY

Automatically Shoot
EIUOGIEY - You cannot access menu with pressing start to pause or change weapons.

Invisible
ESXOYPEY

Enemies Can't Move (Or Be Attacked)
ESOPEPEY - Useless

Invulnerability (But Can't Kill Enemies)
ESSGEPEY - Useless

Enemies Die Soon As They Appear
EISLVTEY - Makes some killable enemies can't be killed at all no matter how time you shoot them.

Enemies Slow Down Directly Beside You
ENSZKZEI - Nice. Makes killing them easier.

Enemies Move Differently
EYVLOTEI - Only side effect from this is enemies shoot only vertically and after killing enemies a single static shot remains where the enemy was.

Enemies Only Move Horizontally
ENEUOTEI

Jump And Hold Either Right Or Left To Fly Across The Screen
ENNOVGEI

Extra Lives Drop From Enemy Kills
EOXGYIEL - Useful

Takes More Shots To Kill Enemies
ESVLOTEY

Instantly Climb Ladders
ENNOYYEI
Note: Turn off on ladders that change screens.

If it matters, all these were made on Cutman stage.

Most of these codes have an errors, so I've added only a few of them.

[Mezmorize]

Thanks. I added most of your codes for Hudson's Adventure Island 2 and 3. You can find a more codes for Adventure Island series?

I might re-visit them later on, but I've already started on Megaman.
Just like the previous games I only tested these for a couple seconds at a time.

Megaman (U) [!]
No Music (Only Sound Effects)
ELNPLZEP

No Audio
EINKLGEY

Remove Health Bar and Score
APNIZLAL

No Enemies
AOSIEPAL

No Enemies (Alt)
ESOSEAEY

Walk Thru Walls
ASOSTYAP

Walk Thru Walls (Alt)
ASUKSIEL

Walk Thru Walls (Alt 2)
ESOKUIEY

Walk Thru Walls (Right Direction)
EIEOETEY
Note: Enemies can't pass thru walls walking right.

Walk Thru Walls (Left Direction)
ESEPVTEY
Note: Enemies can't pass thru walls walking left.

Some Enemies Move Away From You Instead Of Towards
ELSYPTEP

Some Enemies Move Away From You Instead Of Towards (Alt)
EIVUETEY

Some Enemies Fall Down Thru The Floor
EUXLOTEP

Walk Backwards
EIXPYIEY

Automatically Shoot
EIUOGIEY

Invisible
ESXOYPEY

Enemies Can't Move (Or Be Attacked)
ESOPEPEY

Invulnerability (But Can't Kill Enemies)
ESSGEPEY

Enemies Die Soon As They Appear
EISLVTEY

Enemies Slow Down Directly Beside You
ENSZKZEI

Enemies Move Differently
EYVLOTEI

Enemies Only Move Horizontally
ENEUOTEI

Jump And Hold Either Right Or Left To Fly Across The Screen
ENNOVGEI

Extra Lives Drop From Enemy Kills
EOXGYIEL

Takes More Shots To Kill Enemies
ESVLOTEY

Instantly Climb Ladders
ENNOYYEI
Note: Turn off on ladders that change screens.

If it matters, all these were made on cutman stage.

[Unicode]

Thanks.
Here's codes for the third game in the series:
Hudson's Adventure Island III (U) [!]

Invulnerability (Cant Pick Up Items)
AOSXUZAL

Float After Jumping
EPNZZYEL
Note: Turn off the code to fall back down. - This makes player appear little under ground surface on some stages.

No Audio
EUSTVZEP - Nice

Fall Slower After Jumping
EUVZNZEP - Useful

Fruits Appear After Walking By Them (Instead Of Before)
ELOITGEP - Nice

Fruits Are Visible As Soon As They're On The Screen
EUEZPLEP - Useless

Get Items (And Recieve Damage) From Anywhere
EUVZVZEP - Useless

Remove Health Bar
ELNYNIEP

Slow Motion
ESVYPAEY - Sound plays totally bad.

Keep Walking After Letting Go Of Right Or Left
EIVZIAEY - Nice

Hold Down To Stand Up, Otherwise You're Laying Down
ESKXGGEY

Walk Backwards
ESKXLIEY

Walk Without Moving Your Legs
ENUXAGEI - Nice

Fruits Disappear Faster
ESNUTIEY - This makes on score showing up from collecting fruits and make some underwater enemies to move abnormally.

Infinite Health
EIVYSIEY - Useful

Infinite Health (Alt)
ESENNIEY - Useful

Remove Health Bar
ESONUIEY - Nice

Remove Lives, Points, And Fruit Counter
EYKVOYEI - Nice

Slowly Float Upwards While Holding A, Let Go To Slowly Fall
EYSXZAEI - This same code was made already by @megaman_exe, but I deleted his code from database because it has a dawn error: if you swim high before exit to the end on the level 4-6, this code cause you will automatically finish with a incorrect entering into the exit before you approach enough it. If this happens, after your exit in this way the game will not continue (the rest of the health bar won't be scored as bonus, and game won't take you to the boss battle after this level). Unfortunately, nobody responded to fix that error in this code (not least until I deleted it from database).

Float Upwards While Holding A, Let Go To Slowly Fall
EYEZSZEI - Useful

Remove Enemies And Fruits/Powerups
EYNSUAEI - Useless

Makes The Score Counter Display Buggy Coordinates?
EYEYVGEI - Useless, though it doesn't harm gameplay and makes a fun in the game.

Picking Up A Fruit Warps You Somewhere
EPKISLEL - Makes the game have glitched graphics, and after second warping the game froze.

After You Jump, You Float
EPNXIYEL
Note: Turn off the code to fall back down. - Useful

Can Get Fruits By Walking Under Them
EUKKTZEP
Note: Can't get eggs though.

Fruit Fully Restores Health
ELXZLTEP - Useful. After collecting the first fruit, every next collected fruit will makes health bar go over normal limit and health bar itself will be replaced by various sprites. But collecting a Milk or Meat will revert Energy back to the default maximum.

Reverse The Functions Of The Left And Right Buttons
ESNZZAEY

1 Fruit Counts As 11
ESSNOIEY - Nice. It also makes Milk and Meat are counted as 20 instead of 10.

1 Fruit Gives 99 Lives And Lots More Points
ESNYOIEY - It also gives a lots of points from killing enemies.

Jump Much Higher
EYNXSZEI

Swim In The Air
ENEZPYEI - You'll lose any dinosaur (except the purple swimming one) when using the code.

After Jumping, You Fall Back Down Faster
EYUZSZEI

Don't Kick Eggs
EOVZGZEL - Nice

Kick Eggs Further
EUVXOAEP

Touching Enemies Kills Them
EIKZNGEY - Running into enemies while having an Invincibility bee will kill the player.

Touching Enemies Kills Them (Alt)
ESXZOGEY - Touching an enemy while having a dinosaur causes an instant death.

Invulnerability
ESEZVGEY - No boss appear (Tested on World 4' boss).

Thanks. I added most of your codes for Hudson's Adventure Island 2 and 3 to the dababase. You can find a more codes for Adventure Island series?

[Unicode]

Hudson's Adventure Island II (U) [!]

Walk Right To Beat The Stage
AOOXPYAL - You can't beat boss stages on every island with this code.

Walk Right To Beat The Stage (Alt)
EOSXGYEL - You can't beat boss stages on every island with this code.

Float In The Air After Jumping
EUNKOZEP
Note: Turn off the code to drop back down. - Actually you can still come down by walking without disabling the code.

Walk Without Moving Your Legs
ELKXAPEP

Get 2,000 Points At Start Of Round
EUVXOZEP - This works only if you doesn't have a dinosaur riding in beginning of the stage.

No Audio
ELEVUPEP - Nice

Invulnerability (Cant Pick Up Items)
EIEIEIEY

Keep Running After Releasing Right Or Left
EISZPAEY

Automatically Run, Hold B To Walk
ESEZYAEY - This works only if you doesn't have a dinosaur riding.

Travel Faster
ESEXYAEY

Infinite Health
EIUIZAEY - Useful

Infinite Health (Alt)
EYXSPAEI - Useful

Remove Lives Counter
ENXKXTEI - It removes score too.

Start Stage With 10,000 Points
ENKKVTEI - You can't receive any score points from killing enemies, power-ups or fruits.

Score And Lives Constantly Rise
EYNGNYEI - Nice

Ater Picking Up An Item, Score And Lives Constantly Rise
ELNKNYEP

Swim In The Air
EYUZGAEI - Sometimes you can't shoot and go backwards.

Hold Jump To Slowly Float, Let Go To Slowly Fall
EYOLIPEI - Pterodactyl (the flying dinosaur) cannot fly with this code.

Face Opposite Direction When Not Moving
EYEXPGEI

Eggs Already Open, Enemies Automatically Die
EOKIEIEL - When entering boss battle in end of every island, this code destroy boss, but the game won't continue and you won't be able to advance on next island.

Eggs Already Open, Enemies Automatically Die (Alt)
EOKINIEL - When entering boss battle in end of every island, this code destroy boss, but the game won't continue and you won't be able to advance on next island.

Get Items From Anywhere
ELKXGYEP - Useful

Items Worth More Points
EUXGSYEP - Nice

Slow Motion
EYXIOZEI - Doesn't work on boss battles, and disables enemies from appearing.

Food Fully Restores Health
ENKZXPEI - Useful

Food Gives Lives Instead Of Points
EYEXEGEI - Nice

Get Skateboard Instead Of Axe From Egg
EISXVZEY - Nice

Meat Comes Out Of Eggs
EYEXVZEI - In some stages a Milk appears instead of Meat.

Invincibility Pet Comes Out Of Eggs
EYOZSZEI - Nice

Blue Dinosaur Comes Out Of Eggs
EYXZUZEI - Nice

Red Dinosaur Comes Out Of Eggs
EYXXXZEI - Nice

Purple Flying Dinosaur Comes Out Of Eggs
EYUZOZEI - Nice

Purple Dinosaur Comes Out Of Eggs
EYUXEZEI - Nice

Key Comes Out Of Eggs
EYUXNZEI - Useful, though it doesn't work on all eggs. The key takes you on the bonus cloud stage with power-ups.

Key Comes Out Of Eggs (Alt)
EYSZKZEI - Useful, though it doesn't work on all eggs. The key takes you on the bonus cloud stage.

Key To Secret Room Comes Out Of Eggs
EYKZVZEI - Useful

Key To Island Skip Room Comes Out Of Eggs
EYKXSZEI - Useful

Snails Travel Faster
EOUXYZEL

Invulnerability
EOXSUTEL - You will die if try to collect a key for Island Skip Room / Secret Room / Bonus stages from an hidden egg.

Invulnerability (Alt)
ESSSUIEY - Just bad code.

Enemies Die When You Touch Them
ESXSNTEY - If player touch the boss on end of every island, you'll be trapped and game won't advance anymore.

Enemies Die When You Touch Them (Alt)
ENSSKTEI - If player touch the boss on end of every island, you'll be trapped and game won't advance anymore.

Unfortunately, most of these codes are bad and have a various errors. Only about the half of them I've added in database.