3.12M accounts from MPGH (mpgh.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In October 2015, the multiplayer game hacking website MPGH was hacked and 3.1 million user accounts disclosed. The vBulletin forum breach contained usernames, email addresses, IP addresses and salted hashes of passwords.
Source: Have I Been Pwned (CC BY 4.0)