38.1K accounts from Pixel Federation (pixelfederation.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In December 2013, a breach of the web-based game community based in Slovakia exposed over 38,000 accounts which were promptly posted online. The breach included email addresses and unsalted MD5 hashed passwords, many of which were easily converted back to plain text.
Source: Have I Been Pwned (CC BY 4.0)