Turn every gear to its target digit (shown above it) to open the lock.

Tap the ▲ or ▼ on a gear to turn it one step. Digits wrap: 9 + 1 = 0.

Gears are chained. An arrow from gear A to gear B labelled +2 means every step you turn A also turns B two steps the same way. −1 turns B one step the opposite way. Chains only push in the arrow's direction.

Par is the fewest moves possible, so 3 stars means you found a perfect solution. Hints show the best next move; earn more with 3-star solves.