Rule 1: Control the cannon by holding down the left mouse button and sliding it horizontally.
Rule 2: The cannon fires automatically, so focus on aiming it at the numbered blocks.
Rule 3: The numbers on the blocks indicate how many times they need to be hit before they are destroyed.
Rule 4: Avoid letting the blocks reach the bottom of the screen, or the game ends.
Rule 5: As you progress, you'll unlock upgrades to improve your cannon's damage, fire rate, health, or even gain a pet companion.

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The cannon fires automatically, so you just need to focus on aiming it by sliding it left and right.

The numbers indicate how many times the block needs to be hit before it is destroyed.

As you progress through the game and destroy blocks, you will earn points that can be used to purchase upgrades for your cannon.