Sachen 4-in-1: Vol. 1 (Gameboy)

Unlicensed game, containing 4 original games, from the weird third party publisher Sachen. 
Why these guys had so much trouble landing a proper Gameboy license, is beyond us, because the games are actually quite good! 
PLEASE NOTE: The Sachen games only works original DMG Gameboy, and select modern devices. Make sure to research if your device is supported!

Condition: Good!