150K accounts from Rbx.Rocks (rbx.rocks) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesNamesPasswords
In August 2018, the Roblox trading site Rbx.Rocks suffered a data breach. Almost 25k records were sent to HIBP in November and included names, email addresses and passwords stored as bcrypt hashes. In July 2019, a further 125k records emerged bringing the total size of the incident to 150k. The website has since gone offline with a message stating that "Rbx.Rocks v2.0 is currently under construction".
Source: Have I Been Pwned (CC BY 4.0)