From an anonymous donor, here’s a ROM file extracted from a prototype version of Go! Go! Tank for the original Game Boy.
This is a mostly-forgotten game from a mostly-forgotten developer called Copya System, best known I suppose for making Paladin’s Quest on the Super Nintendo. It’s a puzzle game where you plan as an airplane that has to stack up blocks and help a tank move forward, and it has adorable box art, but that’s about all I know.
No one has played this yet to see if it’s any different from the retail version of the game; if you do, and you notice any differences, get in touch!
Thundercats, Commodore 64.