Command your tank through six levels of battle. Destroy every enemy tank to clear a level. Enemies come in three kinds: green light tanks, fast blue tanks and tough red heavy tanks that take three hits.
On a phone: drag with your left thumb to drive. Touch the right side to fire: your turret aims at the nearest enemy automatically, or drag with your right thumb to aim yourself.
On a computer: W A S D to drive, aim with the mouse and hold the button to fire (or hold space to auto-aim).
Brown brick walls break when shot, grey steel walls do not. You have 5 armour points; green repair kits dropped by enemies give one back, and you recover one at the start of each level.