Download here is a 24941 size DOS file that was compressed in such a way that it will only uncompress on XL-XE, wont work OS/A nor OS/B. But the game, which btw appears nice and popular, does work in all OSes. I found an uncompressed file of 38655 bytes. This dl ought to be replaced with uncompressed which seems to be atarimania general policy favoring uncompressed.
The arcade battling looks, feels, and sounds, like Archon.