6.14M accounts from SubaGames (subagames.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In November 2016, the game developer Suba Games suffered a data breach which led to the exposure of 6.1M unique email addresses. Impacted data also included usernames and passwords, most of which appeared circulating in the breached file in plain text after being cracked from salted MD5 hashes. The data was provided to HIBP by dehashed.com.
Source: Have I Been Pwned (CC BY 4.0)