Board Thread:Wiki discussion/@comment-24044830-20140305040350/@comment-1687995-20140425060242

Guests are basically noobs, and they... let's see- DO NOTHING TO ANNOY YOU! I'M FRIENDLY TO GUESTS AND I HELP NOOBS! (Well, guests aren't bad; they're just learning, or they're just trolling.) My original idea was that we could point them all to their own servers so that any malicious behavior against the registered users would finally stop and never happen again. But yes, on consoles and (more recently, PC) video game demos have rolled out, which give a small preview of the features you'd see in the game.

Of course, ROBLOX doesn't have demos; it's online. But I think the guest system is unique to ROBLOX because, what other MMO lets you play any game (you don't have to buy access to) without registering?