Order you should play a game series.

[Kreekakon]

The way I see it, it's generally best to play games by the order they were released.

Reason being that prequels are most often made after the game they come before, and it's most likely intended that you play them the order they were made. Prequels will often have certain allusions to "future events"that are meant to be picked up by people who have already played the game the game is a prequel to.