Tap on a tile to move. Reach the target without getting blasted. Use the fire button to shoot and push cannons and other objects away.
Click on a tile to move to it. Your goal is to reach the target without getting blasted by an enemy cannon. Press the shoot button at the bottom of the screen to fire your laser. Use it to push cannons and other objects out of your way.
Stuck on the later levels? You can turn your tank without moving it by clicking on a blocked-off square.