The Gear Machines are stuck on overdrive. Gears are piling up fast, and if they stack too high everything's going to blow! Keep the machines cleaned out by matching similar gears together. The more you get rid of, the bigger your reward.
Press the Right or Left arrow keys to group gears of the same color together. Connect four or more gears to clear them from the machine. Group more gears together for a higher score. Combo different colored stacks and score point multipliers! As you clear more gears and level up, the machine spits out gears faster, so gears stack up quickly. And be careful of back upsthe machine can belch a bunch of gears at once!