The ball is the most powerful weapon against the alien invasion. It can penetrate into the most secret places and create defenses. To reach the goal it is necessary to pass a complex maze, which is quite dangerous. Do not touch with any surfaces, otherwise the ball will start to fall protection. Use the force of gravity to keep it on track. Fly away traps and other threats to achieve its goal. If the enemies will attack you, use your weapons and put an end to them once and for all.