Fun Math Games for Kids - Math Blaster

MathBlaster.com is a cool, online math virtual world filled with wacky aliens, cool gadgets, and fun math games for boys and girls. Learn math as you complete missions in outer space in this safe and secure virtual world for kids!

ROBLOXOLD: A FREE Virtual World-Building Game with Avatar Chat, 3D Environments, and Physics

ROBLOXOLD is SAFE for kids! ROBLOXOLD is a FREE casual virtual world with fully constructible/desctructible 3D environments and immersive physics. Build, battle, chat, or just hang out.

WebbliWorld - one world, everything to play for

WebbliWorld - an exciting online virtual world for kids that's safe, free and above all, fun! Create a Webbli, make friends, chat, play games, watch films and much more.

Poptropica

Poptropica, a virtual world for kids to travel, play games, compete in head-to-head competition, and communicate safely. Kids can also read books, comics, and see movie clips while they play.

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ROBLOX is SAFE for kids! ROBLOX is a FREE casual virtual world with fully constructible/desctructible environments and immersive physics. Build, battle, chat, or just hang out.