With around $2 million in prize money up for grabs at the League of Legends tournament Riot Games doesn’t take cheating lightly, as one team discovered.

Last week several teams at the World Championship were accused of cheating by looking over at their opponent’s minimap. Riot games originally dismissed all allegations of cheating, but after several fans bought evidence to its attention a full investigation was launched.

After the investigation one team was cleared of any misconduct, three teams were issued warnings, and Korean team Azubu Frost was fined $30,000, which will be donated to Riot Games’ charity program in Korea.