Sync Or Sink

Cooperative submarine survival with repairs coordinated through a shared radio

Low Effort Interactive · Released Oct 1, 2025 · Early Access

Action Adventure Casual Indie Free To Play

Early Access, no updates for over a year

Reviews: Very Positive; 88% of 181
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Untested
Last update on Steam: 1 year ago; Jun 10, 2025
Minimum PC: GTX 970; 8 GB RAM · 1 GB disk; Full requirements

What is Sync Or Sink?

This free-to-play, first-person cooperative survival game is in Early Access and takes place aboard a Cold War submarine where you are trapped with failing systems. Unable to see each other, you and a partner relay codes, repair equipment, and manage scarce resources while compartments flood and engines fail.

For you if...

+you enjoy dark settings and exploring enclosed spaces

Not for you if...

−you prefer clear guidance over figuring out systems yourself

What players say

88% of 181 reviews are positive

Players praise the cooperative premise and working with a partner. Several find it short and too easy once they understand the systems. Recent reviews report unreliable voice chat, getting stuck in walls, and problems joining games.

Screenshots and trailer

Sync Or Sink system requirements

Minimum: GTX 970, 8 GB RAM, 1 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 10
Processor: Core i5 6600
Graphics: GTX 970
Memory: 8 GB RAM
Storage: 1 GB available space

Does Sync Or Sink have co-op or multiplayer?

Yes: co-op online. There is no single-player mode.

Does Sync Or Sink run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Steam features: Family Sharing
Languages: Text only: English.

Does Sync Or Sink use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam