Single-player games like Fathomless
Below are 9 single-player Steam games similar to Fathomless, 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 Fathomless page.
Ranked picks
- 1
Settletopia
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Simulation with Fathomless.
Grow a small colony into a vast, world-spanning civilization. Play solo or with friends as you gather resources, build cities, manage colonist needs, explore uncharted lands, establish logistics, raise armies, forge alliances, and wage wars—all in a living world.
- 2
Corsair Cove
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Simulation with Fathomless.
Build a sprawling pirate haven, raise a fleet to explore the high seas, and take on the Crown to keep the Age of Piracy alive! From ale to flintlock pistols, and from scallywags to swashbucklers, you’ll need to manage complex production chains and govern a rowdy crew to reign supreme over the seas!
- 3
Ascent of Ashes
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Indie with Fathomless.
A colony sim set in a post-apocalyptic dystopia. Build and defend your base. Manage your survivors. Engage raiders, aliens, Remnant soldiers and other factions in real-time-with-pause combat. Or use stealth to outwit them. Explore the massive world. Survive at all costs
- 4
Timberborn
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Indie with Fathomless.
Humans are long gone. In a world struck by droughts and toxic waste, will your lumberpunk beavers do any better? A sandbox city-building game featuring ingenious animals, vertical architecture, water physics, and terraforming. Contains high amounts of wood.
- 5
Zombie Cure Lab
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Simulation with Fathomless.
In a world overrun by the undead, build a lab to fight back with science. Manage survivors, gather vital resources, and turn zombies into allies. Defend your base and research the cure to reclaim humanity.
- 6
After Long Night
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Indie with Fathomless.
After Long Night is a sandbox survival RTS. Build and fortify your base, scavenge every corner for vital resources, craft deadly weapons, and raise a militia to fight off relentless zombie hordes that strike every night. In this world, scavenging isn't just survival—it's strategy, power and war.
- 7
Whiskerwood
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Simulation with Fathomless.
Establish a home for your industrious mice under the oppressive paw of your cat overlords in this city builder featuring complex simulations, intricate production chains, and the age-old rivalry between cat and mouse.
- 8
Nova Roma
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Strategy and Simulation with Fathomless.
The glory of Rome is at your fingertips in this city-building game where you must appease the gods, enact laws, and develop complex supply chains to meet the needs of your citizens.
- 9
The Magical Mixture Mill
Single-player alternative to Fathomless — playable solo, no multiplayer required. Shares Indie and Simulation with Fathomless.
Gather exotic ingredients, brew complex mixtures, and expand your magically automated production lines -- keeping your shelves stocked, your customers happy, and your pockets full.