If your children have no fears of monsters they may find a hidden gem at Moshimonsters. The free online game starts with the premise that, after gaining parental approval, kids can adopt a monster and look after it. The key is that to really get your monster to the point where they can be happy and flourish you need to solve educational puzzle games. The games range from vocabulary and math to logic and spatial skills. The better your child does, the more Rox (or credit) they’ll earn to buy stuff for their monster. There are social networking options here but only within the confines of the site, without going into all of the specifics the folks at Mind Candy are quite zealous about the rules for chatting and posting. It’s free it’s fun and along the way its also educational.