Tested and approved to install, 3D Mega Invaders so quick and easy and works well for mobile phones or tablet - is an excellent 3D game where you have the space to defend against invading aliens. You can choose the difficulty level of easy, medium, hard, and its use automatic shot or not. You can move the space ship using the tilt control, tapping the shoot button on the screen or use buttons to direct the space ship. This game combines the true classic Space Invaders with the 3D gaming experience and the mobile optimized control. The images used in the game are background "courtesy NASA / nasaimages.org of."