Goal. Campaign: clear every enemy tank on the map, then tap NEXT MISSION for a harder one. Solo or co-op with a friend. Versus: 1v1 duel, friendly fire on.
Drive and aim separately. WASD (or arrows) drives the tank. The mouse aims the turret, independent of which way you're driving. Click to fire, right-click (or M) to drop a bomb.
Bounce your shots. Shells ricochet off steel walls and the arena edge once, so you can bank a shot around a corner to hit a tank you can't see straight-on. Careful: your own ricochet can come back and kill you.
Shells. Up to five of your shells can be in the air at once. They break brick in one hit and reinforced in three; steel is unbreakable but bounces them. Your shells are gold, a co-op partner's are cyan, enemy shells red. Two enemy shells that collide in the air knock each other out, so you can shoot down an incoming shot.
Enemies. Colours mean different tanks: brown sits still and lobs slow shots; grey and red hunt you; teal and green are dead-eye snipers (green banks two-bounce shots); yellow and black drop bombs. Later missions mix them.
Bombs. ~3s fuse, armed after 1.5s. They blow on contact or on the timer and catch everyone nearby, including you, so drop and move.
Machine gun and shield. Press B (or tap GUN on a phone) to switch your cannon to a machine gun: a fast, short-range spray that can't bank off walls. Press Space (or tap SHIELD) to raise a bubble for about 1.5 seconds that soaks up any shell that hits you, then it takes a few seconds to recharge. The shield stops shells only, not bomb blasts.
On a phone. The left joystick drives, press it and slide your thumb to steer in any direction. Touch the ring around FIRE to set the turret direction, it holds that heading as you move (the sight in front of your tank shows it). The centre FIRE button shoots. Above the drive wheel sit GUN (switch to the machine gun), SHIELD (raise your shield), and MINE (drop a bomb). In Settings you can switch Aim between DIAL (this), STICK (drag the ring to aim, holding it auto-fires), and TILT (lean the phone to aim). Left-handed? Tap CONTROL (top-right) to swap sides.
Two players. Pick a Campaign co-op or Versus, Copy invite link, and send it. They open the link and tap Join. (Or both type the same room code and pick the same mode.)
Tap to cycle. DIAL: touch the ring to aim, FIRE shoots. STICK: drag the ring to aim, holding it auto-fires. TILT: lean the phone to aim, FIRE shoots.
All of these apply to the whole match and are set by whoever starts the room. Speed: SLOW / NORM / FAST = 0.6x / 1x / 1.4x. Hard to hit: EASY / AVG / HARD sizes the tank's hit target (HARD is a smaller target, so glancing shots miss).
On a computer the volume slider is at the top-right of the screen.