Tool Assisted speedruns [TAS] are played on a computer emulator. The player records the movie on the emulator and submits the movie file to TASvideos.org if the movie file is good enough to obsolete a published run on their site. These types of speedruns take longer to make because the player can use the advantage of going back in time in the game and finding the fastest reactions for enemies and other items to beat the game in a time which the game developer would never thought the game could be beaten so quickly. 