Roblox is free to play. You can visit the official Roblox website (www.roblox.com) or download the Roblox app from the Google Play Store (Android) or the App Store (iOS). Create a Roblox account or log in if you already have one, and you can start playing various games within the platform. While Roblox itself is free, some games may have in-game purchases or optional paid features.