Team Fortress 2 I can only recommend. Great game that can prepare fun also in the longer term a lot. But who wants to define this game, it should perhaps consider taking the same "Orange Box". That is about 20 Euro more and it gets a total of 5 games hineingepackt. Among them are Half Life 2, HL2 Episode 1 + 2, Portal and Team Fortress 2. The course are indeed pure single-player games (Except for TF2 course * g *) but you get quite a few exciting hours of play at that. So I can you really put the orange box to his heart! .-) And no, I'm not a Valve employee, but just a very satisfied customer !! Here is simply right the price / performance ratio.