Cant Be Hit By Explosions(Character 1) 
201C1678 00000000 

Immune To Some Fire Damage(Character 1) (Mostly Stuff Your Character Causes) 
20166E98 00000000 

Enemies Cant Throw Scythes 
20115B18 03E00008 
20115B1C 00000000 

Enemies Cant Throw Axes 
201158E8 03E00008 
201158EC 00000000 

Enemies Cant Shoot Arrows 
20115CF0 03E00008 
20115CF4 00000000 

Enemies Cant Grab Character 1,Also Bear Traps Wont Hold You(You Still Get Damaged) 
201C3E70 03E00008 
201C3E74 00000000 
code is problematic,as in may freeze game,in some later boss fights,so dont use the code in the later parts of the game,like during fights with Verduga,U3 & the bosses beyond.

Ashley Cant Be Grabbed At All By Enemies,She's Also Immune To Bear Traps 
201C3AF8 03E00008 
201C3AFC 00000000 

Stop Most Animations Of Enemies 
2023053C 00000000 
(Their Bodies Still Come At You & Still Attack,You Just Dont See Most Of The Animations.A Useless Code But Neat To Watch The Oddities This Code Causes by Fighting With Them) 

Walk Thru Walls(Character 1)(R3+Up=On/R3+Down=Off) 
D0430FA4 00004008 
201A206C 00000000 
D0430FA4 00004004 
201A206C 0C0688C2 
(Note:If you're aware of the farm area glitch,that you could get behind the scenery and access to some hidden items in a pile.This code will allow you to get behind the scenery and walls in any area of the game and a lot have basically the same hidden items,one of those items will freeze the game if you take it,its called the shotgun,but it looks like an old ammo box,unlike any other ammo box in the game,donft say yes to it,it WILL freeze your game one way or the other.You can skip past some difficult parts of the game,like the gKrauser Conversationh by running around the area of the floor that triggers it,the code only affects walls so you will walk on air if you are off the games programmed paths,so make sure you have a way to get back on the path,since you cant drop down or go up when youfre off the path.If you cant get back,then choose retry from last continue point from the options menu.) 

Enemies Cant Shoot Rockets 
20116180 03E00008 
20116184 00000000 

Toggle Auto Aim V1 On/Off (R1+Up=On/R1+Down=Off) 
D0430FA4 00000028 
70430F63 00000030 
D0430FA4 00000024 
70430F63 00000040 

Toggle Auto Aim V2 On/Off (R1+Up=On/R1+Down=Off) 
D0451402 0000F7EF 
20430F63 00000030 
D0451402 0000F7BF 
20430F63 00000040 

Ada Can Buy Weapons That Are Fully Upgraded and Has Fully Upgraded Start With Weapons 
102F01CE 00000030 
202F01D0 06030107 
202F01D4 0206002F 
102F01D8 00000603 
002F01DA 00000047 
202F01DC 06010106 
202F01EC 03070027 
102F01F0 00000603 
Oops,I didnt know that about the Ada code,sorry.

Some other codes I've hacked for this game:
No Get Floor/Ground Changes/Can Go Thru Some Ground & Floors
(R3+Right=On/R3+Left=Off)
D045160A 00000024
201A20DC 00000000
D045160A 00000084
201A20DC 0C0689B4
(Be careful with this code it can get you in trouble,like the WTWs code can.)

Turn Some Effects On/Off
(R2+Up=Some Effects On/R2+Down=Some Effects Off)
D045160A 00000210
0042DAF4 000000FD
D045160A 00000240
0042DAF4 00000002

I believe its 11,thats the digit thats with the Item Size mods I made.More codes I made for this game.
====Resident Evil 4====
Invincible (L1+Up=On/L1+Down=Off)
D045160A 00000410
201C2C48 00000000
D045160A 00000440
201C2C48 0C070B46
(WARNING! Any head specific attack seems to freeze the game,like chainsaw guys and las plagas.I also donft know if this code has been made already or not.Did the GC version of this code(Disable Hit Detection) have the same problem? I cant remember its been awhile since I played RE4 on my GC.)

Have Access To All Pick-Ups In An Area & Can Open,Save,Climb If that area has those options(R1+Right=On/R1+Left=Off)
E0020820 0045160A
2019DC90 03E00008
2019DC94 00000000
E0020880 0045160A
2019DC90 27BDFFF0
2019DC94 FFBF0000
(WARNING! Dangerous Code.Dont Use This Code Often and Dont Leave It On For Extended Periods Of Time.It makes item and other screen prompts appear onscreen no matter where you are and you can choose them,sometimes getting a different prompt than the one that initially shows up can be hard or impossible,moving around in an area and activating the code at different times can help.This code will also will activate gfoot cuesh that start cutscenes and areafs with no real door but just an opening this code when activated in those areas will make you go thru that opening.DONT USE THIS CODE unless youfre prepared to get in trouble in someway,like freezing the game up or ending up in some weird place and no way to get back to the normal playing area.There are hidden/invisible ladders that Ifve found with this code like in the gondola area and in the lower elevator area before you take it up to the Krauser conversation/fight.)

====Size Of Weapons & Items In Attache Case Modifiers====
(WARNING! You cant buy modified sized items/weapons from a Merchant because the game will freeze,a real bummer,the only fix for getting around this freezing that Ifve found is hooking each of the codes for items/weapons youfve modified to a different joker command and then after youfve placed them in youfre case activate the joker command youfve set and modify its size,but you cant do it before you place it in youfre case or itfll freeze the game.Also you have to keep these codes on after you modify their size,they wont save in their modified shape,you can save the game thatfs not the problem,the problem would be if you saved with modified sized items/weapons in your case and then loaded that save the next time you play without the codes on,because then the game would give the item its default size and that completely screws up your case,like items/weapons can go missing.You can also make items/weapons take up no space at all in your case,but they will not be equippable or usable,except to sell to a Merchant,they somehow remain in your inventory,even though only an image of them may exist in your case.That is another problem: confusion,these codes donft make the image of an item/weapon smaller so images can start to overlap each other if you use multiple modifying codes,its not a big problem it just can start to get difficult to see what you want to equip or use.)
Ifll give an example first to let you know how to use these codes and Ifve posted all codes with their default size digits.

Example:
P.R.L.
203281DC 00000307
The 3 in the value represents its vertical size,3 boxes high.The 7 represents its horizontal size,7 boxes long,taking up a combined amount of 21 boxes in your attache case.If you want the P.R.L. to take up just 1 box of space total(like the size of Eggs) in your case,this would be the code you use:
P.R.L.
203281DC 00000101
If you wanted it to take up no space,and as I mentioned above it will not be usable or equippable,only saleable when you choose this type of modified size,the code would be:
P.R.L.
203281DC 00000000
This example is true of all the codes

All Below Codes Have Default Size Digits
==Weapons==
Matilda
20326DEC 00000205
Punisher
20326E44 00000203
Handgun
20326EF4 00000203
Red9
20326F4C 00000204
Blacktail
20326FA4 00000203
Broken Butterfly
20326FFC 00000204
Killer7
20327054 00000204
Shotgun
203270AC 00000208
Striker
20327104 00000205
Rifle
2032715C 00000109
Rifle (Semi-Auto)
203271B4 00000207
TMP
2032720C 00000203
Chicago Typewriter
20327264 00000307
Rocket Launcher
203272BC 00000208
Mine Thrower
20327314 00000205
Hand Cannon
2032736C 00000204
Riot Shotgun
2032741C 00000208
Rocket Launcher (Special)
20327474 00000208
Infinite Rocket Launcher
203274CC 00000208
Custom TMP (Hunks)
20327524 00000204
Krausers Bow
2032757C 00000307
Grenade
20327B54 00000201
Incendiary Grenade
20327BAC 00000201
Flash Grenade
20327C04 00000201
P.R.L.
203281DC 00000307
Bowgun (Adafs)
20328234 00000305
Shotgun (Adafs)
203282E4 00000206
Chicago Typewriter (Adafs)
2032833C 00000307
==Weapon Gear==
Silencer
203278EC 00000102
Red9 Stock
20327944 00000103
TMP Stock
2032799C 00000202
Scope (Rifle)
203279F4 00000103
Scope (Rifle Semi-Auto)
20327A4C 00000103
Scope (Mine Thrower)
20327AA4 00000202
Infra-Red Scope
20327AFC 00000103
==Ammo==
Handgun Bullets
203275D4 00000102
TMP Bullets
2032762C 00000102
Shotgun Shells
20327684 00000102
Rifle Ammo
203276DC 00000102
Chicago Typewriter Ammo?
20327734 00000102
Hand Cannon Bullets
2032778C 00000102
Magnum Ammo
203277E4 00000102
Mine Darts
2032783C 00000102
Arrows
20327894 00000104
Bowgun Bolts (Ada)
2032828C 00000104

Special Code:Use this if youfre using an Infinite Ammo code and donft want ammo boxes taking up space in your case, whether you picked eem up knowingly or not,sometimes its hard to avoid picking things up.
+++All Ammo Takes Up No Space Code+++
403275D4 00090016
00000000 00000000
2032828C 00000000
==Health/Weapon Items==
Egg
20327CB4 00000101
Brown Egg
20327D0C 00000101
Golden Egg
20327D64 00000101
==Health Items==
1st Aid Spray
20327C5C 00000201
Black Bass
20327DBC 00000301
Black Bass (Large)
20327E14 00000602
Green Herb
20327E6C 00000201
Red Herb
20327EC4 00000201
Yellow Herb
20327F1C 00000201
Green+Red Herb Mix
20327F74 00000201
Green+Yellow Herb Mix
20327FCC 00000201
Red+Yellow Herb Mix
20328024 00000201
Green Herb x2 Mix
2032807C 00000201
Green Herb x3 Mix
203280D4 00000201
Green+Red+Yellow Herb Mix
2032812C 00000201

Special Code:Use this if youfre using an Infinite Health & Max Health code(because it does include yellow herbs & mixes)
+++All Health Items Take Up No Space Except Eggs Code+++
40327DBC 000B0016
00000000 00000000
20327C5C 00000000
(Eggs will still take up space and be usable as weapons with this version of the code)
+++All Health Items Takes Up No Space Including Eggs Code+++
40327C5C 000F0016
00000000 00000000
(Eggs will not take up space and be unusable as weapons with this version of the code)
==Misc. Item==
Plaga Sample (Assignment Ada Item)
20328184 00000201