I mean just use the design of the original into a gameboy pocket size design with innards of a gameboy color system and you will get something like this:
Include 30 or so games built in with working GB slot for your own game cartridges and price it at $129 | £99
recommendations to include:
Pokemon Red/Blue/Yellow
Pokemon Silver/Gold/Red
Zelda Link's Awakening DX
Both Zelda Capcom games
Super Mario Land 1 & 2
Tetris
Dr Mario
Kirby's Dream Land
Metroid ”
Wario Land
Donkey Kong
Pokemon Trading Card Game
Metal Gear GB
Alleway
Include 30 or so games built in with working GB slot for your own game cartridges and price it at $129 | £99
recommendations to include:
Pokemon Red/Blue/Yellow
Pokemon Silver/Gold/Red
Zelda Link's Awakening DX
Both Zelda Capcom games
Super Mario Land 1 & 2
Tetris
Dr Mario
Kirby's Dream Land
Metroid ”
Wario Land
Donkey Kong
Pokemon Trading Card Game
Metal Gear GB
Alleway