Take turns adjusting your power and angle and try and blast your opponent. Each round or game you win earns you money. Use this money to buy extra weapons and shields. Weapons and shields don't get 'used up', you take them into every game you play, but use them wisely so you have some on later rounds. Left and Right to adjust angle, Up and Down to adjust power, Space to fire, hold Shift to change weapons/shields and Press Enter to chat. Press Tab at the main screen to buy additional weapons or shields.