Board Thread:ROBLOX help and discussion/@comment-30519203-20170409133216/@comment-26397550-20170409142122

Any group, site or game offering "free ROBUX" or even free BC is a scam to get your account.

In the case of games you will be presented with a fake login screen. Groups often scam you into joining to get ROBUX but never pay out for it. Sites, even if you aren't going to put your login info into them, do not go onto them. Most will additionally do one (or even more) of the following along with presenting a fake login screen: These sites may also offer other things such as limiteds, limited/hat leaks (don't twitter accounts already exist for that?), free membership, admin on all games or become an admin, etc.
 * Try to install a keylogger onto your computer so that they can get your keystrokes (everything you type) to determine what your username and password are.
 * Try to install a controlling "virus" onto your computer so that they can take control of it or watch what you are doing to see what your login into is.
 * Try to get your ROBLOX cookie that identifies your account so that they can get into your account without necessarily needing login info. Often asks you to paste something from a window popup into something else. (May have been patched?)

TL;DR: Trust NO game that says free robux, nor anything else that seems too good to be true. It's just something to try to get your account under someone else's control.