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Classic Marathon Infinity

From the team that brought you Aleph One, the classic sci-fi FPS Marathon Infinity from Bungie on Mac revived for modern hardware by the fan community.

Released Aug 22, 2024 Developer Aleph One Developers Platforms Windows · Mac · Linux FPS PvP PvE Shooter 2.5D

View on Steam ↗ Free (US · as of 2026-09-25)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-25.

89.6%positive280 reviews

Recommended · 6 found this helpful

“One of the most impenetrable games ever created. The combat is difficult, the maps are mazelike and disorienting and the story is told to you through insane ramblings and disjointed timelines. It rules”

— a player, Steam review · 41 hrs played

Recommended · 3 found this helpful

“Marathon Infinity is the hardest game in the series, and the most cryptic in terms of its story. It's also my favorite in the series. The story is still excellent, but this is Marathon at its most cryptic, disjointed, and postmodern when it comes to its presentation. Some things…”

— a player, Steam review · 26 hrs played

Recommended · 1 found this helpful

“Probably worth it just to get the Apotheosis X mod on Steam Workshop.”

— a player, Steam review · 1 hrs played

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-26.

13achievements

5.9%median completion

3.8%rarest: Vidmaster

Almost everyone has

15.3%Meet the New Boss — Read the first terminal in Rise, Robot, Rise

10.9%Roadrunner — Cripple the Pfhor warning system

9.3%My Personal Peon — Open all the airlocks on Naw Man He's Close

Rarest badges of honor

3.8%Vidmaster — Complete the Vidmaster Challenge on Total Carnage difficulty

4.0%I Totally Know Who You Are — Complete Classic Marathon Infinity on Total Carnage difficulty

4.2%More Than One Path — Read all seven Eat the Path terminals in the same playthrough

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Aug 29, 2025
Aleph One 1.11

This release is not network compatible with the previous release, and films saved with this release cannot be played back with older releases. Highlights: Native Steam Linux support Audio improvements

Aug 08, 2025
Aleph One 1.11b Beta Test

Please help test this beta release. It is not network compatible with the previous release, and films cannot be played back with older releases. Highlights: Native Steam Linux support Audio improvemen

Mar 03, 2025
Aleph One 1.10.1

Classic Marathon Infinity has been updated to use Aleph One 1.10.1. This is a bug fix release. Highlights: Uses HUD filtering preference for Lua HUD images Physics file is no longer mandatory for gath

Aug 25, 2024
Classic Marathon Infinity Hotfix

We have posted an update to fix an issue where BoB could invalidate the the Chapel Groan achievement. Traitorous Pig! If you had trouble getting the achievement before, resume from a game saved in a p

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-25.

Genres	Action, Free To Play
Player tags	FPS · PvP · PvE · Shooter · 2.5D · 3D · First-Person · Action · Linear · Story Rich · Sci-fi · Space (Steam store community voting)
Features	Single-player · Multi-player · PvP · Online PvP · LAN PvP · Co-op · Online Co-op · LAN Co-op
Languages	English
Achievements	13
Official site	https://alephone.lhowon.org

Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS: Windows 10 Processor: 64-bit Processor Memory: 4 GB RAM Storage: 100 MB available space