Commander Keen 9 online DOS game Battle of the Brains is the first of a series of single-player side-scrolling platform video games. The series follows the eponymous Commander Keen, the secret identity of the eight-year-old genius Billy Blaze, as he defends the Earth and the galaxy from alien threats. The gameplay is pretty similar to the precedent ones, but this time is set in a different location, in the unofficial ‘The Universe is Toast’ series, in the desert. The goal of the game is similar, as the main character has to go through different levels and defeat the evil Vorticons, his enemies, who in this version of the game are much more fearful. The game, however, is even more fascinating and curated in every detail, to transport the player in its universe.