Sub Optimal Co.: Navigate Claustrophobic Caves in Your Submarine

8/24/2026, 12:34:11 AM

Release date: 3/17/2026

Tags: #submarine #casual #multiplayer #underwater #automobile-sim #online-co-op #atmospheric #3d

User Reviews

Score: 69%Mixed
Review Count: 13 reviews
Fetched At: 8/24/2026, 12:34:11 AM

Reference prices

Japan

¥ 470 (JPY)

Steam JP

$3.99 (USD)

Steam Global

Live Store Snapshot

Body text may reflect the state at publication time. For the latest sale, price, and review changes, prioritize the live price panel, review panel, and the Steam store listing.

Japan Price: ¥ 470
Global Price: $3.99
Price in Your Region: ¥ 470Prices as Steam lists them per country. What you are actually charged depends on your Steam account settings.Regional prices checked: 27 Aug 2026
Sale Status: Regular pricing
Price Checked At: 8/28/2026, 4:03:34 PM

The price snapshot and review snapshot differ by about 111 hours. Because they are not always refreshed at the same time, confirm the latest Steam listing before making a purchase decision.

Key highlight

Pilot a submarine through 20 atmospheric cave systems in Sub Optimal Co., a cooperative multiplayer diving experience. Navigate carefully with friends or solo, utilizing cameras and sonar.

Who this is for

Recommended for those who enjoy tense cooperative play in confined spaces or slow-paced games that require careful strategic planning. The sense of accomplishment from skillfully navigating challenging caves with friends will be exceptional.

Details

Overview

Sub Optimal Co. invites players into a unique, slow-paced atmospheric diving experience where careful navigation and teamwork are paramount. Developed and published by It's A Sidegame, this title offers a challenging journey through 20 distinct cave systems. Players must pilot their submarine, utilizing cameras and sonar, to reach target locations without succumbing to the hazardous environments. The game emphasizes cooperation, allowing up to five friends to join in operating the submarine, though it can also be tackled solo.

Highlights

Embark on an atmospheric diving adventure through 20 challenging and unique cave systems.
Cooperate with up to five friends to operate the submarine, or brave the depths alone.
Utilize cameras and sonar to navigate treacherous underwater environments and reach objectives.

Who It's For

This game is perfect for players who enjoy cooperative multiplayer experiences with a focus on communication and strategy. If you appreciate atmospheric, slow-burn gameplay that requires precision and teamwork, Sub Optimal Co. offers a unique challenge. It's also suitable for those who enjoy simulation elements, particularly in a unique underwater setting.

Game Info

Sub Optimal Co. is a paid title available on Steam, supporting both single-player and online co-op modes. It was released on March 17, 2026. The game is playable in English and German. Its gameplay blends elements of submarine simulation with casual, atmospheric exploration, making for a distinct multiplayer experience.