This is without a doubt, one of the most fantastic games aviliable ever for the PC, if not the best. It contains amazing graphics even if you don't have a 3D accelerator. It has a envolving story line and challenges you to  solve puzzles and unravel what happened after an explosion turns your  colleagues into aliens. But parents, watch out. This game contains EXTREME  gore, involving you to shoot and kill enemies resulting in buckets of gore  as well as severed heads, bloody limbs and the persons heart. This can be  turned off but trails of blood still remain (very bloody) as well as the  scare factor. If your over 14 I'd say you can handle it, but anyone under  10 should not get this game!