Hugely popular online game League of Legends (LoL) was knocked offline for a few hours on 30 December by hackers.
It was one of several games and social media sites targeted by the Derp hacking group.
Reports suggest the attack was more mischievous than malicious and was partly aimed at US pro-gamer James Varga.
The attack ended with police calling at Mr Varga's house in response to a fake call saying hostages were held there.
