Here's a beautiful 21st century remake of that old arcade classic, Missile Command. Comes with some nice options including a background music toggle, a customized cursor and difficulty modes. Gameplay involves defending your base which consists of a series of structures running along the bottom of the game area. Incoming enemy missiles come from the top which must be destroyed before they hit your base. Points are earned after completing each level which can then be used to repair or rebuild structures in your base.