Prey (Xbox 360, 2006)

This game is quite old, to today's standards, but is actually very interesting. The achievements aren't impossible, but can be time consuming, like the Multiplayer (which is actually quite fun). The plot is ok, but the gameplay makes up for it as you have to think about what you are doing and what you should do next. The game is very fun to play and isn't extremely long or short, it's just right. The graphics are great as well. Basically, if you like games like Doom or Quake, you will enjoy this game as well.