Play Monuments of Mars online — the original 1991 DOS game Works — the full original game runs via DOSBox in your browser
Guide updated October 2026 · Runs via DOSBox + WebAssembly
Monuments of Mars — Todd Replogle's puzzle-platformer for Apogee, made before he went on to Duke Nukem and Cosmo's Cosmic Adventure. An astronaut explores the structures on Mars to find out what happened to a lost NASA crew. Click Play and an episode menu appears: press 1 for First Contact, 2 for The Pyramid, 3 for The Fortress or 4 for The Face.
D-pad: move · CTRL / ALT: jump and fire · ENTER/ESC: menus
⌨ Keyboard — for menus & name entry
Controls — what does what
| Action | Keyboard |
|---|---|
| Choose an episode | 1–4 |
| Move | Arrow keys |
| Jump and fire | The keys shown on the game's help screen |
Runs in your browser tab with DOSBox + WebAssembly — nothing is uploaded. Click the screen to capture input; press Ctrl+F10 to release mouse.
Apogee (3D Realms) released Monuments of Mars as freeware in March 2009. Provenance: /apps/monuments-of-mars/NOTICE.md.
About Monuments of Mars
Monuments of Mars was Todd Replogle's second Apogee game, after Caves of Thor. Each level is a single screen of platforms, doors, switches and traps. Your gun is less for fighting than for solving: shooting switches opens doors and turns obstacles off, and working out the order is the puzzle. Lives are unlimited and you can restart a level whenever you get stuck. Collecting the letters M, A, R and S in order earns bonus points. There are four episodes of twenty levels. Apogee's own records date it only to 1990 or 1991.
Tips for getting started
Before moving, look at what each switch is wired to. If you trap yourself, restart the level rather than wandering.
How it runs here
This is the original DOS release of Monuments of Mars, unmodified, running in DOSBox compiled to WebAssembly. The whole game is about 1 MB, so it starts within seconds on a normal connection. Sound and music play once you click into the game.
Frequently asked questions
Can I play Monuments of Mars online for free?
Yes. Click Play and the original 1991 DOS version starts in your browser, running in a WebAssembly build of DOSBox. Nothing to install and no account.
Why is Monuments of Mars hosted here?
Apogee (3D Realms) released Monuments of Mars as freeware in March 2009. The original files are hosted unmodified.
Does my progress save?
Saved games persist in this browser between visits, best-effort. Clearing site data removes them.
Can I play on a phone or tablet?
Yes. Touch buttons for the keys Monuments of Mars uses appear under the game on touch devices.
More you can play in your browser
Related guides
- Arctic AdventurePlay Arctic Adventure in your browser: George Broussard's 1991 Apogee platformer. Nevada S
- Cosmo's Cosmic AdventureApogee's 1992 platformer in your browser — the complete shareware episode, no download or
- Commander Keenid Software's 1990 platforming classic in your browser — the complete free shareware episo
- Run your own DOS gameHave another DOS game on disk? Drop it into the DOS player.
Want a game like this on your own site?
Monuments of Mars isn't ours to give away — we host it, we didn't write it. But eleven of the games here we did write from scratch, and those are free for anyone to put on their own page: one line of HTML, no account, no permission, no attribution beyond a credit line.