22.3M accounts from R2Games (r2games.com) 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 late 2015, the gaming website R2Games was hacked and more than 2.1M personal records disclosed. The vBulletin forum included IP addresses and passwords stored as salted hashes using a weak implementation enabling many to be rapidly cracked. A further 11M accounts were added to "Have I Been Pwned" in March 2016 and another 9M in July 2016 bringing the total to over 22M.
Source: Have I Been Pwned (CC BY 4.0)