Zwok

This is perhaps the latest incarnation of the good old Tanks/Death Star Battles 'choose strength and angle' shoot-out idea, but with a fully online implementation of the tiny armies seen in Territory War.

You can 'Join up' (which eventually gives you access to more weapons) or pick 'Quick play' (so you don't have to give your email), then you're thrown into a random three-a-side battle across a suitably undulating landscape. Everyone gets about 10 seconds to move and aim their next shot, then the game updates and shows you whether you hit your target, or - sometimes just as likely - got injured by 'friendly fire' from your own side.