Click on one of the concentric wheels, and without releasing, turn it. Let go of the mouse button when the wheel is correctly positioned.

Turn the wheels until they make lines of the same coloured blocks.

Make the number of lines indicated in the centre of the wheels to validate a turn.

The feathered serpent is determined to destroy the world as we know it. Put an end to its vile plan by solving the riddle of the aztec calendar!