well, ive read a few reviews sayin "oh, this is bad for kids and all" but if folks would just follow the ESRB rating system when it comes to games like this....it really boils down to research and common sense....when you see a game with a big scary demon on it with pentagrams, u kno it hasta be either scary or bad or both....i reccommend researching games yourself since not all reviews make an accurate reflection of what you might consider to be alright....if you are into first person shooting w/ alot of gore, then this is the game for you, however, if you are easily frightened, then dont get this game, it will make you very frightened, that is the purpose of games like this, to scare people. basically, you are a marine, stationed on mars, when a teleportation experiment opens the portals of hell. The base is over run, and you are one of the only survivors tasked with repelling this invasion and preventing the orbital fleet from being hijacked and used to transport the demons to earth.....the game is at best very gruesome and in some places sacriligious, so be careful with whatever decision you make....