Did you look at the readme file?
Super Mario Land 2 DX is a romhack of the original Super Mario Land 2 for the GameBoy that turns the game into a GameBoy Color game. It adds color, lets you play with Luigi (with different physics) and removes the lag.
Here is what you need to do:
Get a copy of the unmodified rom, and a copy of the hacked rom. Look inside the files and compare them. A hex editor might be sufficient, but you might need a disassembler.
Comparing the code between the two versions makes a load of sense. It seems like I still need to learn some assembly language first, but this is a reasonable start. Thanks!
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