It's a tank. It's indestructible. It's...

Comrade Hobbes lobs me this late last night. I play it early this morning. You play it - oooh - 30 seconds after reading this post. It's today's web game du jour, a update of last year's Indestructotank, IndestructoTank A.E. You play a tank of indestructibility. Using the explosions of your foes, you have to hurtle around and wipe out attack waves. It's militarised Pinball, and from its splendid old Bitmap Brothers style music on the intro screen onwards it's a thing of beauty. You can almost imagine the attacking ships cursing the name of whoever thought up real physics in games. The bast.