SNK (now SNK Corporation) still holds the copyright. The game is available legally on:
Provides "Trainer" style cheats like infinite lives, bombs, or specialized ammo (e.g., infinite Laser or Super Grenade). metal slug 3 hack rom
Not all hacks are created equal. Over the last fifteen years, the community has produced dozens of variants. Here are the most famous (or infamous) ones. SNK (now SNK Corporation) still holds the copyright
"Insane" versions that increase enemy density and bullet speed for veteran players. or specialized ammo (e.g.
The modding community has created several distinct versions of the game, ranging from simple cheat-enabled files to deep overhauls: