When the Sonic Speedrun Channel was first created it was only known as Foxms15 but at the time Mariosonic15 had no plans to post videos to the channel. But as time went on he decided to post a video to celebrate the (at the time) upcoming release of Sonic Generations. On November 1, 2011, he posted his first video, Sonic the hedgehog Green Hill Zone High score run, to the channel, then after took a small break from posting Sonic games to posting speedruns of Mario games. On December 4, 2011, he resumed posting Sonic speedruns to the channel and has been posting Sonic speedruns ever since (with the exception of this video). On July 11, 2012, Mariosonic15 opened a second channel, MS15LetsPlay, for Lets Plays of games. He is currently trying to set up the channel and hopes to post a video on it by the end of the month.