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Guests were a feature introduced in September 2008, which allowed users to play without registering an account. Guests would appear in the leaderboard with numbers, ranging from 0 to 9999.

Roblox stored which Guest ID you would receive, and using a cookie editor, some users changed their ID commonly to “666” or “1337” to mess with players. Guests avatars were originally based on the Roblox account's appearance, but eventually, Roblox made three accounts called “BillyBloxxer”,

“BettyBloxxer”, and “DefaultGuest”. Users who selected to play as a boy, girl, or genderless would have the corresponding avatar of those three accounts, respectively. From 2008 to 2014, Guests had “Super Safe Chat” which had custom message presets to send. Until their removal, they couldn't speak.