3.97M accounts from IDC Games (idcgames.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 March 2021, 4 million records sourced from IDC Games were shared on a public hacking forum. The data included usernames, email addresses and passwords stored as salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)