[quote name='skateraXVIII']Any of these activate on steam?[/QUOTE]
Origin.
This is an amazing deal. Just for the single player alone, original Crysis is a good 8-12 depending on how fast you rush and difficulty, Warhead is about 5-8. Crysis 2 is a good 7-10. $30 for a guaranteed 20 hours of single player is a damn good deal, plus the decent multiplayer, plus the oodles of mods out there for CryEngine 2, and the soon to be tons of CryEngine 3 mods.
Buy this if you like FPS.