Protect 9 different motherboards from waves of viruses attacking your main processor. Don't let the virus crash your computer! Place different attack towers on the motherboard to kill the virus. Place firewalls on their path. Use the radar to improve towers fire range. All towers need energy to work. Place your energy towers strategically to maximize your available energy.
Click on a tower to select it. Move your mouse over the motherboard and find an available place. Click to place the tower. Send the next wave before the timer ends to gain bonus points.