That’s right, Space Invaders has made it’s way to the iphone.  This the same game we all remember from the atari days.  You’re “ship” is at the bottom and can be moved by holding it with your finger and moving it back and forth across the screen.  To shot, simply double tap the screen and you fire a missile to the alien beings above.
Currently there is a free and a paid version in the app store.  The free version, which I tested, gives you all the fun game play but …