1.02M accounts from R2 (2017 forum breach) (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 addressesPasswordsUsernamesWebsite activity
In early 2017, the forum for the gaming website R2 Games was hacked. R2 had previously appeared on HIBP in 2015 after a prior incident. This one exposed over 1 million unique user accounts and corresponding MD5 password hashes with no salt.
Source: Have I Been Pwned (CC BY 4.0)