If you are into intellectual hard deciphering puzzles and want to try smt new then this is the stop for you. Portal has a variety of maps to kp u busy.

If you are into zombie outbreaks and rampage hoards of unstoppable monsters then you must check out this franchise! Is kill or be killed.

The Half-Life Series has been and still is one of the biggest action/adventure games that grabs you from the moment you get off of that train.