52.5K accounts from Roblox (roblox.com) were exposed in this breach. Besides email addresses, it included account balances, iP addresses and purchases.
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Account balancesEmail addressesIP addressesPurchasesUsernames
In August 2016, Roblox disclosed a data breach that affected over 50k users. The security incident impacted email and IP addresses, usernames, purchases and Robux balances which were left exposed on a test server.
Source: Have I Been Pwned (CC BY 4.0)