This game is very fun, and even educational to some extent! The real-world physics in this game are incredible, and playing around with the Portal gun is a blast. But for littler kids, it might be wise to steer clear. This is a puzzle game, meaning that violence is kept to a minimum. However, the player is always in danger of falling to his/her death, being riddled by inanimate turrets, or being vaporized by an energy ball. Whenever the player gets hit by one of the turrets (Who are really only in a few levels) blood splatters appear on the wall or ground behind. You can't really kill anything, but instead, you just knock over the cute little gun turrets. Portal is a fun game, and family friendly for kids 10 and up, but know your kid's maturity level and use your good judgment. Now enter the internet. Portal uses the Source game engine, which means that mods can be downloaded for it from the program that runs Portal, Steam. If your child has a Steam account, this means that he/she has access to many demos and mods to download. Mods are like add-ons to a game. Basically it's a ton of bloody games that your child would have at the click of a button if they own both Portal and Steam. He could download a brutal, bloody medieval mod, or download a grotesque zombie survival mod, or maybe even a western mod. If you want to keep your child away from these mods, keep taps on what they are doing on their Steam account, and pay attention to the game that they are playing. Know your kid, know what he/she is doing.