Your mission in this defense (shooter) game with 4 colors. 15 levels, 15 weapons and upgrades, 3 bosses and endless mode is to stay alive as long as possible while shooting colored circles. use your mouse to aim and hold left mouse button to fire. press the spacebar to change the color of your bullet. press "s" key to launch a bomb. for each successfully finished level you earn some money that you can use on your fortress upgrade or on weapon upgrade. good luck!
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