Roblox, the online game creation MMO has surpassed the one million user mark during its open alpha test.

Roblox lets players create their own utopias online and populate them with levels featuring real-times physics. Think a 3D version of LittleBigPlanet for PCs and you're along the right lines.

As it's free to play, Roblox has attracted over a million users through word of mouth and is helping players of all ages grasp the fundamentals of game design.

Those who look to get serious about Roblox creation can upgrade to advanced Builders Club memberships and make use of insanely intricate creation tools.

Budding coders or creative types should head over to the official Roblox site and get creating the games they've always dreamed of.