Kas1e is working on a Amiga OS4 version of the game Battle Tanks. You can try the game but it has a few bugs at the moment. The sound is disabled, the game sometimes freezes or crashes and the icons are not that beautiful. Battle Tanks is a fun game, where you can choose one of three vehicles and eliminate your enemy using the whole arsenal of weapons. The game is open source, multiplayer and cross-platform (Amiga, Windows, Linux and Mac).
The Battle Tanks web page.