Do we really not have a thread for this or is the search just broken? Anyway, managed to get this game running in Nemu (albeit with seizurific graphics and bizarre sound) by turning off audio HLE (and video until you get in-game). So here's some stuff I'm surprised hasn't been done yet.
811353F2 ???? Loose Coin/Coin Block Value Modifier
8113540A yyyy Loose Coins: If Coins > x, Reset To y
(800EA328 writes HP when hitting a heart block)
810EA326 00?? Heart Blocks Set Your HP To x
810EA32A 0003 Above Code Affects Max HP Instead
8125E44E 00?? Gain x Star Points After Each Battle
8127CA32 00?? Get x Star Points For Each Enemy
Note: You can have up to 100 star points per battle.Consider these beta, because I haven't tested to see if they work in more than one area (fairly good chance they don't) or freeze the game in other places (probably do). I need sleep now.
Also, didn't someone make a levitation code? I can't find Mario's Y speed anywhere.
 They seem to work fine. Also, reformatted.
is now live (but may take a few tries to load)
currently down; check out my PSP/DS/Game Boy/Windows/Linux homebrew, ROM hacks, and Gameshark codes!