UFO: Enemy Unknown (marketed as X-COM: UFO Defense in North America) is a science fiction strategy video game developed by Mythos Games and MicroProse. It was published by MicroProse in 1994 for the PC DOS and Amiga computers and the Amiga CD32 console, and in 1995 for the PlayStation. Its European PlayStation release is titled X-COM: Enemy Unknown.

(from en.wikipedia.org)