Use your war ship to fight other war ships as the victor gets what lies in the treasure box between you and other ships. Aim your cannon at the sky and fire with the right power so that you sink them first before they do the same to you. You can upgrade the power loading movement time, health, armor and cannon damage of your ship when you have the required money for it.
Aim correctly with your war ships cannon at the sky to fire and take out other ships. The winner takes the treasure.