Single-player games like Mars Underground
Below are 9 single-player Steam games similar to Mars Underground, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Mars Underground page.
Ranked picks
- 1
Isles of Sea and Sky
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
A fantastic, oceanic, open world puzzle adventure. Solve innovative block puzzles while unearthing a mystifying story, gaining new friends that change the puzzle landscape, and unlocking powers that provide more options for how you choose to progress through the enigmatic Isles of Sea and Sky.
- 2
ANIMAL WELL
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
Explore a dense, interconnected labyrinth, and unravel its many secrets. Collect items to manipulate your environment in surprising and meaningful ways. Encounter beautiful and unsettling creatures, as you attempt to survive what lurks in the dark. There is more than what you see.
- 3
TR-49
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Adventure with Mars Underground.
A World War II computer. An archive of lost books. A world-changing secret. Narrative deduction meets audio drama, from the creators of Overboard!, Heaven's Vault and A Highland Song.
- 4
Mindcop
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
Mindcop is a non-linear „whodunnit“ detective game. It mixes a story driven adventure with real-time puzzle gaming. As the infamous Mindcop, you can dive into the minds of your suspects to uncover their secrets and unravel their lies.
- 5
To the Moon
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
A story-driven experience about two doctors traversing backwards through a dying man's memories to artificially fulfill his last wish.
- 6
Reventure
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
The one and only non-linear adventure with 100 different endings. Don't just wishlist me. I'm not that expensive... also, look at those reviews!
- 7
Angeline Era
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
Explore a secret-filled land in this 3D Action-Adventure, where every level is hidden in plain sight! Travel and fight through a vast, unmarked overworld. The next surprise is only a single search away!
- 8
Alt-Frequencies
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie with Mars Underground.
An audio mystery set in a time loop. Record, rewind time and broadcast snippets of radio shows to expose radio hosts, conspiracy theorists and politicians.
- 9
House
Single-player alternative to Mars Underground — playable solo, no multiplayer required. Shares Indie and Adventure with Mars Underground.
Try to survive through the night in a house that's trying its best to kill you and your family.