-Defend against waves of robots -Hold your mouse over a tower and press e to upgrade it (Upgrades cost the cost of the tower, there is 2 for each tower) v Towers v -Basic (10 cost) -Rocket (25 cost) -Close (20 cost) -Sniper (25 cost) -Laser (50 cost) -Ghost (50 cost) -Money Generator (50 cost)
