Play Commander Keen 9: Battle Of The Brains Online

Commander Keen 9: Battle of the Brains is a science fiction platform game released for MS-DOS in 2011. The game continues the narrative from the previous title, placing players in control of Commander Keen as he pursues the villain Mortimer McMire. The story follows Keen's efforts to thwart a plan that threatens the universe, involving travel across multiple distant worlds.

Players guide Commander Keen through a series of side-view levels set across four distinct planets. The primary objective is to locate and activate specific controls on each world. Successfully activating these controls unlocks access to a final, heavily guarded teleporter. Progression is structured around exploring these environments, navigating platforming challenges, and interacting with the game's systems to advance the story. Gameplay involves precise jumping, avoiding hazards, and likely engaging with enemies or puzzles, though specific mechanics are tied to the classic platforming style of the series. The player must complete the objectives on each planet in sequence to ultimately reach Mortimer McMire and confront him.