If you’re planning to visit Roblox.com on regular basis or to develop your own games, I would advise you to sign up for a Roblox account.
But if you just want to try it out the games on their platform, you can also sign in as guest on Roblox. We’re about to show you how to do that:
1 Go to the Roblox login page
2 Click on the ‘play as guest’ button
You’ll find it right under ‘You don’t need an account to play Roblox’ when you scroll down.
V Result: You can start to play immediately
Without having to log in, you can start to play your favorite games. Enjoy the fun!
Source screenshots (& thanks to): roblox.com