It's a HK hack of a gameboy or gameboy color game. They take for example the Fatal Fury Game Boy game, and change names, alter graphics a little ect.
You can do any of this if you have programming knowledge, to even make your own games if you have the Gameboy Flash Rom thing and can transfer roms to your PC. Just like people do with NGPC games.
Ive seen KOF 99 gameboy carts before, and other wierd stuff like that.
And they seem to have put it in a gameboy advance cartridge casing.
[ August 07, 2001: Message edited by: Drift King EX ]