Single-player games like K2-18b: Legacy
Below are 8 single-player Steam games similar to K2-18b: Legacy, 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 K2-18b: Legacy page.
Ranked picks
- 1
Descent Horizon
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
Guide a lunar lander through dangerous descents in Descent Horizon, a 2D physics-based sci-fi exploration game. Search abandoned lunar infrastructure, salvage parts, repair your systems, and survive a repeating cycle of impossible landings.
- 2
Flux Empyrean
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
The Flux is not keen on giving away its secrets, and you’re one of them. Sail a vast planet under a blanket of stars and use your tools and wits to remind yourself of what was lost and what could come next. An open world mystery about understanding the end of the world.
- 3
CODEX vs SCIENCE (Not Talos Principles)
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
CODEX vs SCIENCE (Not Talos Principles) is a gripping narrative walking simulator set in "Rio de Janeiro" , the last city standing. Guided by SKYNET, explore dark ruins, uncover powerful notes, and question reality itself. A mysterious journey blending faith and science—dare to discover the truth.
- 4
Dofamine
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
You must explore the labyrinth of riddles and investigate the apocalyptic event at the research facility following the experiments with the Higgs boson, or “the God particle”.
- 5
Newton's Fourth Law
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
Fight against brain-rot in this story-driven educational physics puzzle game. You will need to learn and apply high school physics concepts to solve increasingly challenging problems and uncover a galaxy spanning plot. When you have finished, you will be able to take a college level physics course.
- 6
Ambrosia Sky: Act One
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Adventure and Simulation with K2-18b: Legacy.
You left. Now they’re dead. Ambrosia Sky: Act One is an immersive sim about exploring an asteroid colony devastated by an unknown contamination. Survive and harvest strains of hostile alien fungi, explore treacherous environments, and find meaning and beauty in so much death—the first of two acts.
- 7
The Witness
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
You wake up, alone, on a strange island full of puzzles that will challenge and surprise you.
- 8
The Invincible
Single-player alternative to K2-18b: Legacy — playable solo, no multiplayer required. Shares Indie and Adventure with K2-18b: Legacy.
Rethink human’s dominion in The Invincible: a story-driven adventure set in a hard sci-fi world by Stanisław Lem. Discover planet Regis III as scientist Yasna, use atompunk tools looking for a missing crew and face unforeseen threats. Make choices in a philosophical story that’s driven by science.