Marathon Infinity
The final classic Marathon campaign twists through competing timelines, alien battles, and the series' most ambitious story.
Free to play
Claim this free game to your account. You can download an available package directly or use the optional Windows platform for installation and updates.
What players should know
Marathon Infinity closes the original trilogy with a story that refuses to run in a straight line. Its campaign revisits events from different angles while the familiar FPS combat grows stranger and more demanding. What does this download include? Aleph One's full Windows ZIP for Infinity, including its own game data and Classic Marathon Infinity.exe. No Steam account or prior trilogy installation is needed. Extract the package and launch the executable. The trailer and screenshots are for the original Infinity release as presented by the Aleph One team. This is not footage or artwork from Bungie's newer Marathon game. License and credits Aleph One engine code is GPLv3. The original Infinity campaign, artwork, and branding retain separate copyright and are made available for free play with permission. Promotional images are from the Aleph One team's Classic Marathon Infinity publisher page. Downloads come directly from the original project. NeonRoof does not host or repackage the game files. Independent catalog listing. NeonRoof is not affiliated with or endorsed by this project's developers. Downloads are provided by the project's official distribution source.
Latest patch notes
Original Windows package: Aleph One 2025-08-29. Upstream archive unchanged. Static package inspection confirmed Classic Marathon Infinity.exe.
Key features
- Final original Marathon campaign
- Branching, nonlinear story
- Classic sci-fi first-person combat
- Standalone Aleph One build
- Game modes
- Single-player; multiplayer
- Languages
- See the original project documentation and in-game language settings.
- Controls
- See original project documentation for input-device support.
Before you install
Minimum
Windows PC. Refer to the original project documentation for supported versions and hardware.
Recommended
Refer to the original project's compatibility and graphics-driver guidance. NeonRoof has not independently benchmarked this release.
Gameplay and presentation
Editorials about Marathon Infinity
More indie developer storiesQuick preview
Explore Marathon Infinity
Marathon Infinity FAQ
What is Marathon Infinity?
The final classic Marathon campaign twists through competing timelines, alien battles, and the series' most ambitious story.
Is Marathon Infinity free?
Yes. Marathon Infinity is listed as a free game on NeonRoof.
Where does the Marathon Infinity download come from?
NeonRoof sends players to the official Marathon Infinity project or developer distribution source. NeonRoof does not claim to be the game's developer.
Which platforms support Marathon Infinity?
PC
Is Marathon Infinity open source?
The code license is GNU GPL v3. The media license is Original game data; free distribution with permission. Code and artwork can use different licenses, so check the linked project notices before redistributing or modifying the game.
Unofficial Marathon Infinity shirts, mugs, hoodies, hats, mouse pads, and more
No game-branded merchandise is currently published. Generic recommended gear appears below when available.
Gear for playing Marathon Infinity
Generic PC gaming accessories selected for NeonRoof players. These products are not official Marathon Infinity merchandise or endorsements.
Portable Foldable Car Waterproof And Hard-wearing Pet Cage Waterproof Thickened Dog Mat Car Pet Mat
Overview: The PVC pipe is waterproof and rust-proof, sturdy and durable, not easy to break. Premium Seat Belt Harness: Our seat belt harness can let your pet stay in the seat. Adjustable chuck fixing strap makes the dog safety seat sturdy, and not easy to slip. High-quality wate…
$22.99 + shipping
Pet Cooling Pad Bed For Dogs Cats Puppy Kitten Cool Mat Pet Blanket Ice Silk Material Soft For Summer Sleeping Blue Breathable
Overview： 1. Cooling Material: The cooling mat is made of high-tech cooling cloth, which makes your pet enjoy a better cooling effect in summer. 2. Size: Three different sizes, fit for small, medium, and large breeds of dogs and cats. With the self-cooling mat, the puppy kitten…
$7.99 + shipping
Silicone Flying Saucer Funny Pets Dog Cat Toy Dog Game Flying Discs Resistant Chew Puppy Training Interactive Pet Supplies
Overview: 1. Available in Assorted colors 2. Competition approved 3. Disc shape designed specificly for dogs Specification: [Product Name]: Pet toys [Product specifications]: diameter 20cm, weight: 40g [Product material]: environmentally friendly plastic material 【Applicable to】…
$5.99 + shipping
Pure Sine Wave Inverter 3500 Watt Power Inverter, DC 12V To AC 120V Car Inverter, With USB Port LCD Display Remote Controller And AC Outlets For RV Truck Car S…
Recommended pure sine wave inverter 3500 watt power inverter, dc 12v to ac 120v car inverter, with usb port lcd display remote controller and ac outlets for rv truck car s… for PC and indie gaming setups.
$234.99 + shippingSimilar games
Explore the full NeonRoof guide to games similar to Marathon Infinity, including match reasons, genres, tags, platforms, and prices.
8Bit Killer
A free first-person shooter with chunky 8-bit visuals and arcade-paced combat.
Aleph One
Experience free science-fiction shooter campaigns and multiplayer through Aleph One, the open-source continuation of the Marathon engine.
Alien Arena
Fight through fast sci-fi arena matches with classic modes, bots, and online multiplayer.
Anarch
Explore a tiny, portable 1990s-style first-person world built from scratch with public-domain code and art.