Classic DOS Platformer
Commander Keen
Billy Blaze's 1990 Mars adventure — smooth EGA scrolling from the team that would later make Doom. Keyboard only, in your browser via DOSBox.
←→ run · ↑ jump · ↓ duck · Esc pause / menu
First load downloads the emulator and game (~150 KB) and caches them. If the screen stays black, click it once and wait.