This is my second MOST FAVOURITE GAME. Goes on the same level with Fallout 1/2. UFO X-COM have many sequels and remakes. But surely, the most awesome is hardcore original. On some computers it can launch without any emulators. If you have no lack with this, like me, then try DosBox.
+ supreme game atmosphere
+ stunning plot and gameplay
+ great soundtrack
- bitch-difficulty even on very basic skill level [this turns into constant save'n'loading process during battle part of the game, but even that doesn't spoil it too much]. Oh, one more... permanent shortage of Elerium 115. So, be prepared for challenge.
BTW, here is a link to excellent X-COM community.
Legal purchase here: