Space Out

A Space Invaders–style fixed-shooter where waves of aliens descend from the top of the screen and you defend the bottom with a horizontally-moving ship. It’s the oldest game in this section by a decade: Space Out started life in Windows 95 Game Developer’s Guide in 1996 — that’s a Space Out alien and saucer on the book’s cover — and came back as a C++ demo in Beginning Game Programming eight years later. The download here is the later version. It was ported again to J2ME as a mobile game.