Free games like Nuclear Sub
Below are 9 free-to-play Steam games similar to Nuclear Sub, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Nuclear Sub page.
Ranked picks
- 1
Ultimate Custom Night
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Action and Indie with Nuclear Sub.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
- 2
Indigo Park: Chapter 1
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Action and Indie with Nuclear Sub.
Explore the abandoned childhood wonder of Indigo Park! Guided by Rambley the Raccoon, help restore power to the destroyed amusement park while you run from the reason it shut down.
- 3
Counter-Strike:Global Offensive
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Action with Nuclear Sub.
Counter-Strike:Global Offensive (CS:GO) expands upon the team-based action gameplay that it pioneered when it was launched over 2 decades ago. CS:GO features new maps, characters, weapons, and game modes, and delivers updated versions of the classic CS content (de_dust2, etc.).
- 4
The Lab
Free-to-play alternative to Nuclear Sub — no purchase or trial window.
Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!
- 5
OnlyCans: Thirst Date
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Indie and Simulation with Nuclear Sub.
Feel The Fizz Inside You™ with the brand new Shize™ Collection!
- 6
93, Kuindzhi
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Indie with Nuclear Sub.
Kuindzhi, 93 is an atmospheric first-person narrative vignette about an 18-year-old boy from Donbas. The story takes us to March 2022, when the world changed forever — into a space where the past, fears, and doubts find their voice.
- 7
DORONKO WANKO
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Action and Simulation with Nuclear Sub.
『DORONKO WANKO』 is a DORONKO Action Game. In this game, You can become a cute, innocent Pomeranian, make your master's home messy and dirty. "Will the master be angry with me?" Don't worry. Because you are a sweet doggie.
- 8
Landfall Archives
Free-to-play alternative to Nuclear Sub — no purchase or trial window. Shares Action and Strategy with Nuclear Sub.
Break into the Landfall Archives to steal and play previously unreleased games, demos, interactive slide shows, and even an unreleased version of Totally Accurate Battle Simulator from 2017!
- 9
Nuclear Sub: Prologue
Free-to-play alternative to Nuclear Sub — no purchase or trial window.
The Prologue is just part of the gameplay that awaits you in the full version of the game. A realistic nuclear submarine simulator will allow you to take command of your crew and battle your fiercest enemies. Arm yourself with missiles, dive into the ocean and fight for your country