Your goal is to sink your opponent's rafts before he sinks yours.
First of all use your mouse to turn the wheel to aim your catpult. Then
set the power to your desired level and finally press the Launch button
During normal rounds, you will take turns firing at each other's rafts.
During speed rounds, it's an all out war, go as fast as you can. Be
careful not to sink your own (red) rafts - you can try again if you lose
a round, but you only get 3 extra tries.