1. Doom. http://en.wikipedia.org/wiki/Doom_(video_game)
2. Quake Live. http://www.quakelive.com/#!home
3. Marathon. http://en.wikipedia.org/wiki/Marathon_(video_game)
4. Blake Stone: aliens of gold. http://en.wikipedia.org/wiki/Blake_Stone:_Aliens_of_Gold
5. Star wars: dark forces. http://en.wikipedia.org/wiki/Star_Wars:_Dark_Forces