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Roblox is an online virtual building game for kids and teens, you can meet people from all over the world, build things or play games. You make your own character, explore new places on roblox made by different users, you can also buy buy builders club and two other tiers which have their own advantages in earning money such as `robux` the currency used on roblox. You can also make groups if you are you a member on builders club, which you have to pay or you can join a group/clan for free.
Source link: http://sales.roblox.com/