You have 185 seconds. That is a little over 3 minutes. You move the cannon with the arrows. Contol allows you to fire a harmony stone. You can click with the mouse on a stone, and if there are 3 or more next to eachother, they will be consumed and transferd to your points.
Type of stones:
- Elements of Harmony: Make groups for points
- Ereaser (horn): Click, and all blocks next to the ereaser will be removed.
- Block block (X): Does nothing, except be in your way.
- Surprise block (?): Changes into a random block.