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Best Sci-fi Games

Top 50 of 1,062 qualifying games — tagged Sci-fi (community voting), 1,000+ reviews · ranked by Wilson lower bound on Steam review score · review data as of 2026-05-20.

1 买个可乐饼吧！ - Buy a Croquette! (2024) RPGMaker · Mystery · Sci-fi · 100K–200K owners · Free 99.0%4,397 reviews 2 Portal 2 (2011) Platformer · Puzzle · First-Person · 5M–10M owners · $9.99 98.7%433,510 reviews 3 Portal (2007) Puzzle · Puzzle-Platformer · First-Person · 10M–20M owners · $9.99 98.5%177,741 reviews 4 planetarian HD (2017) Visual Novel · Anime · Casual · 20K–50K owners · $9.99 98.9%2,981 reviews 5 Picayune Dreams (2023) Bullet Hell · Psychedelic · Action Roguelike · 100K–200K owners · $4.99 98.8%3,219 reviews 6 Half-Life: Alyx (2020) VR · FPS · Story Rich · 2M–5M owners · $59.99 98.3%97,229 reviews 7 Katana ZERO (2019) Pixel Graphics · Action · Great Soundtrack · 2M–5M owners · $14.99 98.0%71,069 reviews 8 Just a To the Moon Series Beach Episode (2024) Story Rich · Adventure · Emotional · 200K–500K owners · $7.99 98.4%2,921 reviews 9 RimWorld (2018) Colony Sim · Base-Building · Survival · 5M–10M owners · $34.99 98.0%210,517 reviews 10 Aliya: Timelink (2024) RPG · Interactive Fiction · Visual Novel · 200K–500K owners · $2.99 98.2%6,512 reviews 11 Gravitas (2019) Free to Play · Puzzle · Puzzle-Platformer · 200K–500K owners · Free 98.0%6,875 reviews 12 Loddlenaut (2023) Underwater · Relaxing · Open World · 100K–200K owners · $19.99 98.1%4,399 reviews 13 Dyson Sphere Program (2021) Automation · Space · Base-Building · 2M–5M owners · $19.99 97.7%85,088 reviews 14 Half-Life 2 (2004) FPS · Action · Sci-fi · 10M–20M owners · $9.99 97.6%245,627 reviews 15 STAR WARS Empire at War - Gold Pack (2010) Strategy · RTS · Space · 1M–2M owners · $19.99 97.6%39,435 reviews 16 Split Fiction (2025) Co-op · Split Screen · Female Protagonist · 2M–5M owners · $49.99 97.5%81,558 reviews 17 Don't Escape: 4 Days to Survive (2019) Adventure · Pixel Graphics · Point & Click · 100K–200K owners · $14.99 98.0%2,272 reviews 18 VA-11 Hall-A: Cyberpunk Bartender Action (2016) Cyberpunk · Visual Novel · Pixel Graphics · 500K–1M owners · $14.99 97.4%36,462 reviews 19 Gunpoint (2013) Stealth · Indie · Puzzle · 500K–1M owners · $9.99 97.5%13,093 reviews 20 SANABI (2023) Pixel Graphics · Story Rich · Action · 500K–1M owners · $14.99 97.4%35,954 reviews 21 ARMORED HEAD (2020) Arena Shooter · FPS · Action · 50K–100K owners · $2.49 98.1%1,227 reviews 22 Deep Rock Galactic (2020) Dwarf · Co-op · PvE · 5M–10M owners · $8.99 97.3%343,000 reviews 23 STEINS;GATE (2016) Visual Novel · Story Rich · Anime · 500K–1M owners · $29.99 97.4%21,078 reviews 24 Stray (2022) Cats · Adventure · Atmospheric · 5M–10M owners · $29.99 97.3%156,607 reviews 25 Lethal Company (2023) Online Co-Op · Horror · First-Person · 10M–20M owners · $9.99 97.2%487,160 reviews 26 Satisfactory (2024) Base-Building · Automation · Open World · 10M–20M owners · $39.99 97.2%232,064 reviews 27 Zortch (2023) FPS · Shooter · Action · 100K–200K owners · $4.99 98.0%1,152 reviews 28 Subnautica (2018) Open World Survival Craft · Survival · Horror · 5M–10M owners · $7.49 97.0%313,707 reviews 29 Half-Life 2: Episode Two (2007) FPS · Action · Sci-fi · 5M–10M owners · $19.99 97.1%41,782 reviews 30 planetarian ~the reverie of a little planet~ (2014) Visual Novel · Anime · Post-apocalyptic · 50K–100K owners · Free 97.6%2,032 reviews 31 Oxygen Not Included (2019) Colony Sim · Base-Building · Survival · 2M–5M owners · $24.99 96.8%128,390 reviews 32 No Time (2019) Time Travel · Time Manipulation · Sandbox · 20K–50K owners · $12.99 97.5%1,705 reviews 33 SIGNALIS (2022) Survival Horror · Psychological Horror · Female Protagonist · 1M–2M owners · $19.99 96.8%26,157 reviews 34 Brotato (2023) Rogue-like · Singleplayer · Action Roguelike · 2M–5M owners · $4.99 96.7%97,801 reviews 35 Supreme Commander: Forged Alliance (2011) Strategy · RTS · Sci-fi · 1M–2M owners · $12.99 96.8%13,468 reviews 36 LEGO Star Wars - The Complete Saga (2009) LEGO · Local Co-Op · Adventure · 1M–2M owners · $19.99 96.7%23,787 reviews 37 Half-Life (1998) FPS · Classic · 1990's · 10M–20M owners · $9.99 96.5%148,221 reviews 38 R.E.P.O. (2025) Horror · Online Co-Op · Multiplayer · 10M–20M owners · $6.99 96.5%185,642 reviews 39 Day of the Tentacle Remastered (2016) Point & Click · Adventure · Classic · 500K–1M owners · $14.99 97.0%4,437 reviews 40 Quake (2007) FPS · Classic · Action · 1M–2M owners · $9.99 96.7%14,400 reviews 41 LIZARDS MUST DIE (2023) Historical · Souls-like · Spectacle fighter · 500K–1M owners · $0.79 96.6%26,132 reviews 42 Arctic Eggs (2024) Cooking · Physics · Sci-fi · 200K–500K owners · $9.99 96.9%3,691 reviews 43 DOOM + DOOM II (2007) FPS · Classic · 1990's · 1M–2M owners · $9.99 96.5%24,984 reviews 44 Abiotic Factor (2025) Survival · Online Co-Op · Open World Survival Craft · 500K–1M owners · $34.99 96.4%31,274 reviews 45 Universe Sandbox (2015) Sandbox · Space · Simulation · 1M–2M owners · $29.99 96.4%27,448 reviews 46 I Was a Teenage Exocolonist (2022) Choices Matter · Life Sim · Deckbuilding · 200K–500K owners · $12.49 96.7%3,931 reviews 47 Orbt XL (2017) Arcade · Difficult · Relaxing · 200K–500K owners · $0.99 96.7%3,369 reviews 48 Primordia (2012) Point & Click · Adventure · Post-apocalyptic · 100K–200K owners · $9.99 96.7%3,302 reviews 49 Warhammer 40,000: Dawn of War - Dark Crusade (2007) Strategy · Warhammer 40K · RTS · 1M–2M owners · Free 96.5%8,976 reviews 50 OPUS: Echo of Starsong - Full Bloom Edition (2021) Visual Novel · Emotional · Anime · 200K–500K owners · $24.99 96.4%8,773 reviews