Free games like Marathon
Below are 9 free-to-play Steam games similar to Marathon, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Marathon page.
Ranked picks
- 1
Ultimate Custom Night
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
- 2
Indigo Park: Chapter 1
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
Explore the abandoned childhood wonder of Indigo Park! Guided by Rambley the Raccoon, help restore power to the destroyed amusement park while you run from the reason it shut down.
- 3
STRAFTAT
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
STRAFTAT is a 1v1/2v2 ONLINE first person SHOOTER with quick rounds in over 350 MAPS ; Including all WEAPONS, proximity chat and 4 players FFA.
- 4
Counter-Strike:Global Offensive
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
Counter-Strike:Global Offensive (CS:GO) expands upon the team-based action gameplay that it pioneered when it was launched over 2 decades ago. CS:GO features new maps, characters, weapons, and game modes, and delivers updated versions of the classic CS content (de_dust2, etc.).
- 5
The Lab
Free-to-play alternative to Marathon — no purchase or trial window.
Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!
- 6
Hello Neighbor Alpha 2
Free-to-play alternative to Marathon — no purchase or trial window.
Welcome to Alpha 2 of Hello Neighbor. Play against an advanced, self-learning AI in what eventually became Act 1 of Hello Neighbor - the stealth horror home invasion sim.
- 7
NERTS! Online
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
NERTS! Online is a fast-paced competitive solitaire game for you and up to five of your friends, played the same way we play it at the Zachtronics office!
- 8
Hog Hunter 2021
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
Hog hunter is a short atmospheric game about catching hogs out in the wild, be careful though not everything in the woods is safe...
- 9
Delta Force
Free-to-play alternative to Marathon — no purchase or trial window. Shares Action with Marathon.
Play for free in operator-based extraction and full-scale combined arms warfare. Become elite Operators, customize an ever-expanding arsenal of weapons, and deploy into thrill-packed missions across multiple modes.