SZNESXVK Infinite lives
GZELVXSE Infinite life meter (except if you hit a spike)
SXUASXOU Quick pick up
AEUEKKGL Special "squat" high jumps
PPXAOIAA Princess has mega-float
PAXAOIAA Princess has mega-float and lunar descent
PESEGLGA Super moonjumps for Mario
AAEEZGPA Mega moonjumps for Luigi
PENALLGA Super moonjumps for Toad
PAXAPGGA Super moonjumps for Princess
AEXALGZA Speed up enemies
GOEANKAO USEEEKKA Walk backwards
XVVANSZK XVNEXSZV Super turbo running
AEVAVIIA AENEEITA Permanent turbo running
AXSETUAO ESVAPUEV Super fast run for Mario
AZEEGKAO EIEEYKEV Super fast run for Luigi
AXNAIUAO ESNEAUEV Fast run for Toad
AZXALKAO EIXATKEV Super fast run for Princess
AXNAZSAA EVNALSEY Super speed enemies

Note: There are two versions given for some of the following Codes.
If one code doesn't work on your game, then try the alternate Code.
YESUAPTE / YESLPPTE Strong Wart
IAVENYZE / IAVEUYZE Strong Birdetta
YEVXVYLE / YEVZNYLE Strong Hawkmouth
AAVENYZA / AAVEUYZA Weak Birdetta
TPEPLAAX / TONENYAX Birdetta spits eggs instead of fireballs (appears in late
levels of the game)
YAXXIYZE Strong Tryclyde
YAVXVGGE Strong Fryguy
YAEXTPGE Strong Clawgrip
PEEPUZAG IUEPSZAA TEEPVZPA Start on World 2
ZEEPUZAG IUEPSZAA TEEPVZPA Start on World 3
LEEPUZAG IUEPSZAA TEEPVZPA Start on World 4
GEEPUZAG IUEPSZAA TEEPVZPA Start on World 5
IEEPUZAG IUEPSZAA TEEPVZPA Start on World 6
TEEPUZAG IUEPSZAA TEEPVZPA Start on World 7