Single-player games like Flat Mars
Below are 8 single-player Steam games similar to Flat Mars, 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 Flat Mars page.
Ranked picks
- 1
HellRock Diver
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Dig through Hell. Kill the horde. Choose your power. Descend deeper. A roguelike shooter-platformer where the ground is your weapon and every boss kill makes you stronger.
- 2
Planet Zombie
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
A retro zombie shooter first-person bullet heaven that descends, level by level. 50 levels deep in 9 acts. 2,800 zombies on screen at once, kills counted per second. A fight against the zombies and for your mind.
- 3
Kill Cast
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Born from classic arcade top down shooters like Smash TV and 80’s action thriller The Running Man! Welcome to Kill Cast Show! An FPS bullet raining shooter where you must survive endless wave of mutants. It's the gameshow of the future where contestants fight for survival.
- 4
TIME STRIKE
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
TIME STRIKE is a single-player FPS that gives you maximum control: stop time to dodge projectiles, rip down walls, line up a headshot, and flip flying debris into hapless enemies. CONTROL TIME. CONTROL SPACE.
- 5
Galactic Disharmony
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
A Sci-fi First-person shooter and Strategy game. Command and control your fleets and planets, build troops and extract resources in the solar maps' turn-based strategic mode. Then head into battle with your troops in large-scale first-person warfare to conquer planets.
- 6
SHROT
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Welcome to SHROT! A fast, funny, and unapologetically stupid first-person boomer shooter where a Slavic trucker gets stuck in an alien apocalypse and handles it the only way he knows how: with beer, cigarettes, and unresolved anger issues.
- 7
MEAT PARADE
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Kill endless enemies and become a god among a plethora of enemies and bosses. With FPS movement controls Kill to progress, pick your upgrades and make unique builds as you fight the horde.
- 8
GoreBox
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
GoreBox is a chaotic physics-driven sandbox where creativity meets destruction. Use the Reality Crusher to spawn, manipulate, and obliterate anything. Customize, battle with friends, roleplay, or face devious creatures. In this world, your imagination rules—and chaos is your playground!