I played a bit of Tank Universal today and it’s an interesting blend of a Tron-like style, old-style tank games, and various game modes like capture-the-flag, first-person running around, puzzles, and straight-up blow-stuff-up.  I got to a point where it was hard to outrun this giant enemy and failing to do so reset an annoying switch maze that I’d have to do over again, so I gave up on it at that point after a couple of frustrating attempts.  Not bad, but not a keeper.