In Heavy Mach., you control a tank that trundles from left to right, blowing everything in its path to pieces (stop us if you've heard this before). The controls are easy to pick up. Gentle tilting advances the tank or throws it into reverse, you aim your weapon by sliding your thumb up and down the right side of the screen, and your left thumb controls your jump throttle and switches weapons. The game's separated into several big stages, which are divided into four or five submissions each. If you take a certain amount of damage from enemy guns, or fall into a pit, you'll fail the mission and have to restart it.