codes for Super Mario Bros. 1
most of these were found by me.
YEAAAA (not mine) - Super Trippy Mario
PAILGG & PAILLG (2 liner) - can only move up/down. Mario behaves like he's on a vine.
ZAZUPI - jumping crashes the game basically, there's nothing else to say, it just makes the game impossible.
EAZUPI & PAZLZI - Small Mario jumps with the Big Mario jump sound and vice versa. also, you can't run.
NNTTZO - different and weird fireball physics. Fire Mario's colors are also different.