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I'm an okay creator, I don't make much of anything special, but if I put a lot of effort into it, I could make something good, although not a full level, usually a gadget like a sackbot grappling hook, or flying machine. I've been playing Team Fortress 2 on my PC for a while, and it's amazing, definitely MUCH too violent for kids, but someone made a downloadable mod on gamebanana to make it non-violent.