RetroGames
DOS games from the early '90s, running right in your browser. No install.
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Commander Keen 1: Marooned on Mars
Billy Blaze built a spaceship, and the Vorticons stole the parts. Hop around Mars to find them and get home. (1990)
Commander Keen 4: Secret of the Oracle
Keen heads to the Shadowlands to rescue the Council of Elders. Pogo, jump and stun your way through. (1991)
The Even More Incredible Machine
Balls, belts, mice in wheels and cats with bad tempers. Put the parts together to solve each puzzle. (1993, demo)
How to play
Commander Keen 1: arrows to move, Ctrl to jump, Alt to pogo once you find it, Ctrl + Alt to shoot once you have the ray gun. Space shows your status.
Commander Keen 4: arrows to move, Ctrl to jump, Alt to pogo, Space to shoot. Enter shows your status. Save from the main menu with Esc.
Incredible Machine: drag parts from the bin into the puzzle, then press the green start button to see if it works.
Saved games stay in this browser on this device. Click the game first so it gets your keys, and use the menu on the left for full screen and sound.