I've got a confession, I have never played marathon. I know, I know this is kinda like the kid who has never heard or played zelda, but I wasn't a pc gamer until medal of honor allied assault.
Bungie (yes the makers of halo and marathon) are giving the 3 marathon games away free. These games are suppose to be a huge influence on the Halo franchise so I figured I'll give them a go. At this price who can resist.
Download for pc and mac here