"Tanks is a free and exciting, turn-based multiplayer game you can play with your friends - or take on the world."
There's quite a few decent games available in the Marketplace right now, but few have had the courage to go all-multiplayer as this title does. I think the appeal might have been broader with a single-player, but hey, you can't argue against the price - free! Search the marketplace or try this link (launches Zune).
"A planner is a gentle man, with neither sword nor pistol.
He walks along most daintily, because his balls are crystal."