Games is already one of YouTube's biggest categories alongside music, but a new monthly chart published by industry site Tubefilter, based on data from analytics firm OpenSlate, shows its scale. The most popular games channel is no surprise: PewDiePie has been the biggest channel of any category on YouTube for some time. Felix Kjellberg’s videos were watched 311.2m times in May, with 27.3m people subscribing to his channel.