Some of the codes that I figured out
Adventure Island 2
ANGUEL - Eggs stay vertical when hit
LISTEN - Can't Use Eggs
Balloon Fight
LATTEX - Enemies Can't Blow Up Balloons (Except Level 1)
Bubble Bobble
SOONEA - Light Blue Everything
ATKIPX - After bursting bubble... Points go up to maximum
Chip N Dale Rescue Rangers
GAEIIEVI - Don't Get Stunned (ex: Heavy Grey Blocks, Ball At Boss Fights)
NYEIIEVS - Longer Stun
SXXKEP - Can jump normal with heavy object (like apple)
Kickle Cubicle
ANTKVT - Infinite Time
NEVELL - Instant "Time Up"
XUALIT - Ice Pillar Created 6 cells up
AUALIT - Ice Pillar Created 4 cells down, 2 if facing direction
KILIPA - Repeat Landing
KVALPT - When Ice Blocks Are Pushed They Shatter
ATVVET - Once Ice Block Is Destroyed No More Come
Micro Machines
VSVSVS - Computer Cars Don't Race
POLESS - Drive Through Vehicles
YUPIEA - Start on Qualifying Race Forever
LAISNO - All Vehicles Fire Weapons
AAKKTT - Invisible Vehicles
Pac-Mania
ANTGUN - Trapped Ghosts
LYAAAL - No Points From Anything
SOLIVA - Go Through Ghosts (Can die if you jump with jumping one)
EELSGO - Once one ghost is eaten no more can be
NITSUA - Can't eat ghosts
LAISNO - Can get center item multiple times
PEASNA - All Ghosts Worth 3200
Quatro Arcade
Go Dizzy Go
XVTILU - Walk Through Walls
XVTIVU - Walk Through Enemies
The Simpsons: Bart vs. The Space Mutants
SOXNOA - Infinite Spraypaint
ETA: Removed some of my rescue ranger ones since I didn't test them in my NES and can't seem to get them working now.
Adventure Island 2
ANGUEL - Eggs stay vertical when hit
LISTEN - Can't Use Eggs
Balloon Fight
LATTEX - Enemies Can't Blow Up Balloons (Except Level 1)
Bubble Bobble
SOONEA - Light Blue Everything
ATKIPX - After bursting bubble... Points go up to maximum
Chip N Dale Rescue Rangers
GAEIIEVI - Don't Get Stunned (ex: Heavy Grey Blocks, Ball At Boss Fights)
NYEIIEVS - Longer Stun
SXXKEP - Can jump normal with heavy object (like apple)
Kickle Cubicle
ANTKVT - Infinite Time
NEVELL - Instant "Time Up"
XUALIT - Ice Pillar Created 6 cells up
AUALIT - Ice Pillar Created 4 cells down, 2 if facing direction
KILIPA - Repeat Landing
KVALPT - When Ice Blocks Are Pushed They Shatter
ATVVET - Once Ice Block Is Destroyed No More Come
Micro Machines
VSVSVS - Computer Cars Don't Race
POLESS - Drive Through Vehicles
YUPIEA - Start on Qualifying Race Forever
LAISNO - All Vehicles Fire Weapons
AAKKTT - Invisible Vehicles
Pac-Mania
ANTGUN - Trapped Ghosts
LYAAAL - No Points From Anything
SOLIVA - Go Through Ghosts (Can die if you jump with jumping one)
EELSGO - Once one ghost is eaten no more can be
NITSUA - Can't eat ghosts
LAISNO - Can get center item multiple times
PEASNA - All Ghosts Worth 3200
Quatro Arcade
Go Dizzy Go
XVTILU - Walk Through Walls
XVTIVU - Walk Through Enemies
The Simpsons: Bart vs. The Space Mutants
SOXNOA - Infinite Spraypaint
ETA: Removed some of my rescue ranger ones since I didn't test them in my NES and can't seem to get them working now.

I'll see what else I can think to come up with for Quatro Arcade before I take it out of my NES.
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