Marathon (1994) in your browser Free & legal
1994 · Bungie Software · System 7 · Basilisk II (Mac IIfx) · 640×480 at 8-bit colour
Guide updated September 2026 · needs your own copy
Before Halo, Bungie was a small Chicago company making games only for the Macintosh, and Marathon is the one that made their name. It came out in December 1994, six months after Doom shipped on DOS, and it did several things Doom did not: you could look up and down, the levels had real architecture, and — unusually for a shooter in 1994 — it had a plot worth reading.
This is the original Macintosh release running on an emulated Macintosh IIfx. Bungie put the whole trilogy into free redistribution in 2005, so there is nothing grey about it: the entire game is here, legally, at no cost.
Controls
| Arrow keys | Move forward, back and turn |
| Space | Fire |
| Tab | Switch weapon |
| Shift | Run |
| Z / X | Sidestep left and right |
| Delete | Action — open doors, use terminals, flip switches |
| M | Map |
| Esc | Pause and quit |
Bungie released the Marathon trilogy for free redistribution in 2005 and has repeatedly blessed the community's continued distribution of it since, including the Aleph One bundles and the free Steam release. This is the original 1994 Macintosh build, not a port.
Get the trilogy for yourself
- Aleph One — the open-source engine, bundled with all three games, free, for macOS, Windows and Linux. This is what to use if you want mouselook and a modern resolution.
- Original game data on GitHub — Bungie's files, preserved.
How it works & what to expect
| Machine | Macintosh IIfx, 32 MB RAM, 640×480 at 256 colours |
|---|---|
| System | System 7.5.3 |
| Emulator | Basilisk II, compiled to WebAssembly |
| Speed | Comfortable on a desktop or laptop. A phone will struggle — this is the most demanding thing on the site. |
| Saves | Marathon saves at pattern buffers inside the level; those saves live in your browser |
Marathon ran on a 68040 Macintosh in 1994 and it wants roughly that much machine, which is a real ask for an interpreter running in a browser tab. On a modern desktop it is fine. On a phone it runs, but not at a framerate you would choose to fight in. Reduce the window size inside the game (the plus and minus keys) if it feels heavy.
What Marathon actually is
You are a security officer aboard the UESC Marathon, a colony ship built out of the hollowed-out Martian moon Deimos, in orbit around Tau Ceti IV. An alien slave empire called the Pfhor attacks. That is the last simple sentence available about the plot.
What makes Marathon different is that the story is told through computer terminals scattered through the levels, and the three shipboard AIs talking to you through them do not agree with each other. Leela is helpful and straightforward. Durandal is rampant — a technical term in the game's fiction for an AI that has gone through anger and despair and out the other side into something like megalomania — and he is funny, unreliable, and by a distance the most memorable character in a 1994 shooter. Tycho is a third thing entirely.
Mechanically it holds up better than most of its generation. There is real verticality, oxygen management in vacuum levels, friendly BOBs you can accidentally shoot, dual-wielded pistols, and a physics model the community was modifying within months of release.
The trilogy, and where to go next
Marathon (1994) was followed by Marathon 2: Durandal in 1995 — which added liquid you could swim in, better level design and a Windows 95 port, the first Bungie game most PC owners saw — and Marathon Infinity in 1996, which shipped with the level editor and a story that deliberately fractures.
All three are free. If you want them at a modern resolution with mouselook, the community engine Aleph One is the way: it is open source, actively maintained, and runs on everything. What you get here instead is the 1994 experience exactly as it shipped, keyboard turning and all.
And the lineage is not subtle. Read Durandal's terminals, then think about Cortana.
Questions people ask
Is this really free?
Yes, and not in a wink-wink way. Bungie authorised free redistribution of the entire Marathon trilogy in 2005, has acknowledged the community's distribution of it repeatedly since, and the trilogy was published free on Steam in 2024 with Bungie's blessing.
Is this the full game or a demo?
The full game. All of Marathon, every level, not a shareware chapter.
Why can't I look up and down with the mouse?
Because it is 1994. Marathon does support mouse aiming, but the default configuration is keyboard turning, which is what most people used at the time. If you want modern controls, the Aleph One engine is the better route — it is linked below.
Is Marathon connected to Halo?
Same studio, and the connections are deliberate. The rampant AI Durandal is the clear ancestor of Cortana, several weapons and ideas carry over, and Bungie has always treated them as part of one lineage. Marathon is not set in the Halo universe, but it is unmistakably the same people.
It runs slowly. What can I do?
Shrink the game window with the minus key inside Marathon — it renders fewer pixels and the framerate jumps. Close other tabs. And use a desktop or laptop if you can: this is the heaviest title on the site.
Where do I save?
At the pattern buffers — the glowing terminal-like devices inside levels. Marathon does not let you save anywhere you like, which takes some getting used to.
What are the BOBs?
Born On Board — the civilian crew. They follow you, they shoot at the Pfhor, they are not very good at it, and they will absolutely walk into your line of fire. Shooting too many of them has consequences.