Extinction Day
Games like Extinction Day

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single-players with secrets you find without a guideor

Games like Extinction Day

A single-player strategy sim about combining global disasters to wipe out humanity before they reach the Ark, with a darkly playful tone but short, repetitious pacing.

Half-Earth Socialism
A short, cryptic strategy sim where you plan a future society's technologies and policies to reach ecological utopia or ruin.
2022-07-19
- Strategy
- Indie

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Games like Extinction Day | IndieDex

Extinction Day
Games like Extinction Day

Find the Steam hidden gems

single-players with secrets you find without a guideor

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Games like Extinction Day

A single-player strategy sim about combining global disasters to wipe out humanity before they reach the Ark, with a darkly playful tone but short, repetitious pacing.

Half-Earth Socialism
A short, cryptic strategy sim where you plan a future society's technologies and policies to reach ecological utopia or ruin.
2022-07-19
- Strategy
- Indie

Simulator

Antivirus PROTOCOL

A compact incremental strategy game about upgrading an antivirus to destroy a global virus, with rewarding but sometimes slow progression.

2025-09-17

Action
Strategy
Indie
Simulator

Ash & Adam's Existential Treads

A compact action city-builder about growing a settlement, fending off enemy waves, and restoring nature in a post-post-apocalyptic world, with a short campaign.

2026-05-03

Action
Strategy
Bird view / Isometric
Indie
Arcade

Excidio The Kaiju Simulator

A single-player kaiju sandbox that lets you smash physics-based cities, with a small but cinematic destruction loop that reviewers spent roughly 18-24 hours in.

2026-02-21

Action
Indie

Infectonator 3: Apocalypse

A campy pixel-art arcade sim about playing the villain and spreading a zombie plague across the globe, with a fun but sometimes punishing loop and roughly 7–9 hours of reviewer playtime.

2018-05-10

Action
Comedy
Science fiction
Horror
Strategy
Bird view / Isometric
Indie
Simulator

Project Planet - Earth vs Humanity

An asymmetric strategy party game playable solo or with friends, where one player as Planet Earth tries to wipe out humanity while up to five others cooperate to survive, featuring choices-matter branching and a short ~4-hour playtime.

2023-09-25

Science fiction
Strategy
Indie
Text
Turn-based strategy (TBS)

Quarantine Zone: The Last Check

A tense single-player strategy/sim of checkpoint defense and survivor screening in a zombie apocalypse, with meaningful choices but persistent inspection bugs and about 10 hours of playtime.

2026-01-12

Action
First person
Science fiction
Strategy
Indie
Simulator
Sandbox

Bio Inc. Redemption

A medical strategy sim where you either engineer a lethal illness or lead a team to cure a patient, with a short, darkly funny diagnostician campaign.

2018-03-08

Puzzle
Horror
Strategy
Indie
Simulator
Sandbox
Educational

Beecarbonize

A short, engaging single-player card strategy game about managing society and fighting climate change with a humorous, educational tone.

2023-08-01

Action
Survival
Strategy
Simulator
Card & Board Game

The Universim

A single-player god-game strategy about managing a planet and guiding its civilization through ages, though reviews note timer-driven progression and occasional bugs, with a ~14-hour median playtime.

2024-01-22

Survival
Strategy
Bird view / Isometric
Indie
Simulator
Open world

God For A Day

A short dark-comedy narrative sim where you play the Son of God, blessing or condemning residents based on their hidden stories, with mixed reviews and a roughly 85-minute playthrough.

2026-06-16

Comedy
Adventure
Side view
Simulator

Dead 4 Now: Bio-Weapon Simulator

A compact strategy sim where you craft lethal bio-weapons and iterate through trial-and-error to achieve global annihilation.

2026-04-17

First person
Strategy
Bird view / Isometric
Indie
Simulator
Business

Half-Earth Socialism