find the correct path and solutions for your bullet,controll your bullet to kill all aliens. in pure puzzle mode: you only can fire one bullet each level.but you can controll the bullet after fire,let it stop or change direction. press space key can stop bullet,press again let it go on fly.fire bullet and change direction by click mouse(fire as first change direction ).if bullet is stop,not only change direction click mouse will make it go on move.the number of times for click is limited each level.don't let bullet touch edge of scene in this mode. in chaos mode: in this mode,you can't controll bullet after fire.bullet will be held back by edge of scene.bullet's lifetime and number is limited.
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