8.24M accounts from Gamigo (gamigo.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In March 2012, the German online game publisher Gamigo was hacked and more than 8 million accounts publicly leaked. The breach included email addresses and passwords stored as weak MD5 hashes with no salt.
Source: Have I Been Pwned (CC BY 4.0)