Z-Out

Z-Out is a 2D sci-fi shoot 'em up created by Advantec and published by Rainbow Arts in 1990 for Amiga and Atari ST.

The game was released as the sequel of X-Out, another horizontal scrolling shooter, even though this was not the initial idea of the developer. You can notice it because the game is probably more similar to R-Type rather than X-Out. However, Z-Out can be defined as the typical 16-bit shooter you could expect in 1990: great music (composed by the legendary Chris Hülsbeck), excellent graphics (with an organic/sci-fi style inspired to Aliens), and a difficulty level set to "impossible".

Z-Out has a difference though: it can be played by two friends simultaneously in co-op. But don't think that this will make your life easier, because the developer decided that two people should have fewer power-ups and no restart points. Don't forget to use good joysticks!