- Half-Life/Half-Life 2
- The original Fallout
- The original Doom
- Brutal Doom (the campaign)
- Star Control 2 (The Ur'Quan Masters fan-made modernized version)
- The Neverhood
- Subnautica (not Below Zer0)
- Duke Nukem 3D
- Total Annihilation
- Megaman (the first one)
- Megaman X (the first one)
- Team Fortress 2
- Portal 2
This is by no means an all inclusive list. These are just games that I personally played that fit the criteria.