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
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. Kill to progress, pick your upgrades and make unique builds as you fight the horde.
- 2
Leviticus
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Leviticus is a dark sci-fi action game where you play as an angel sent to guard those made in his image. Tasked with defending humanity, you patrol the stars and destroy alien intruders, beings that were never made in the image of God. Fight across space, uncover and enforce Heaven’s decree.
- 3
Zero Distance
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Zero Distance is a 3D zombie bullet heaven where weapons fire automatically and upgrades combine into build-changing synergies. Survive 20 escalating minutes, kill the final boss, and reach the extraction helicopter.
- 4
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.
- 5
VOID/BREAKER
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Fast paced Bullet hell Roguelite FPS 🔴 Fight relentless machines driven by a hostile AI. Escape an endless cycle. Craft infinite weapon variants with deep gun modding. Forge deadly synergies. Carve your way out through enviro destruction /BREAK THE SYSTEM /BREAK FREE
- 6
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!
- 7
Just Cause 4 Reloaded
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Rogue agent Rico Rodriguez journeys to Solis, a huge South American world home of conflict, oppression and extreme weather conditions. Strap into your wingsuit, equip your fully customizable grappling hook, and get ready to bring the thunder!
- 8
DOOM Eternal
Single-player alternative to Flat Mars — playable solo, no multiplayer required. Shares Action with Flat Mars.
Hell’s armies have invaded Earth. Become the Slayer in an epic single-player campaign to conquer demons across dimensions and stop the final destruction of humanity. The only thing they fear... is you.