AEANLE: Shorter walking and running animation, missing a frame.
PEANLE: Walking with butt, or driving an invisible car.
POSTEN: Moonwalking, 360 jumps.
AUNTXY: Mario's feet spin when running off a platform.
TIEEZT: Shadow Mario
POSTON: When Mario looks forward he's Luigi, when he looks backwards, he's orange Mario.
PONEYS: Mario doesn't change color when you get a fire flower.
AZIPAK: Ground of two types of brick.
AXEPAK: Ground of pipes.
AOTAEA: Corrupted graphics.
YONANA: Line Graphics, perhaps graphics are shuffled.
ZXLUUU: Rain coins.
YYOPAK: All things are missing from the background besides the clouds.
SIKPAK: Messed up background.
EONAKA: Messy background.
KOPPOK: No bushes or hills.
AAOPAK: No background.
IIAAZT: Always look like Fire Mario.
OPEALY: At the start of every level, it says "TIME OUT".
OSTPGP: Pipes take you to other places, enemies are different.
UUPOGS: Moves stationary objects and holes.
GENOAS: Changes what objects are, for example, pipes are islands.
PAOEPO: Coin boxes blink faster.
EAKKPO: No enemies.
AKAPIG: Jump at start to survive, there's blocks at the start.
SIPPOG: Mesed up underwater levels.
ZOTPOG: Hammer Bros. and jumping turtles everywhere.
IPEPNY: Bowser fire in 1-1.
NPEPNY: Bullet bills in 1-1.
KPEPNY: Flying fish in 1-1.
OPEPNY: Lakitu in 1-1.
SIPPNG: Underwater castles.
SNAPEL: Weird pipes, peach blocks, weird music.
EATOZS: Endless wall.
SOSAKA: Lots of ? blocks and axes.