In the world of Sega Genesis homebrew and ROM hacking , this file is often the main source file that developers use to compile a playable ROM. It contains the "brain" of the game—the logic for Sonic’s physics, enemy AI, and level transitions. Sega Genesis/Mega Drive. Language: Motorola 68000 Assembly.

to save 2 bytes and 4 cycles. If you need a bit-perfect build of the original ROM, you must use macros to force the unoptimized version.