IMHO.

Single-player games like Fish Idle 2: Underwater Mystery

Below are 10 single-player Steam games similar to Fish Idle 2: Underwater Mystery, 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 Fish Idle 2: Underwater Mystery page.

Ranked picks

  1. 1
    Fisher Idle — Steam game cover

    Fisher Idle

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Adventure with Fish Idle 2: Underwater Mystery.

    Start from scratch in the middle of the ocean as a fisherman! Buy bigger boats, upgrade your ships, and build your fishing empire. Remember: more fish means more gold!

    2025IndieAdventureCasual1.99 USDSingle-playerSimilar games →
  2. 2
    Sea Town - Fish Market Simulator — Steam game cover

    Sea Town - Fish Market Simulator

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Adventure and Casual with Fish Idle 2: Underwater Mystery.

    Build your fishing empire in Sea Town - Fish Market Simulator! Explore oceans, upgrade boats, and conquer a dynamic market across unique islands. Ready to rule the seas? Start now!

    2025AdventureSimulationCasual3.99 USDSingle-playerSimilar games →
  3. 3
    Deadliest Catch: The Game — Steam game cover

    Deadliest Catch: The Game

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Adventure with Fish Idle 2: Underwater Mystery.

    Enter the dangerous world of king crab fishing in the deadly Bering Sea! Take command of your own fishing vessel, use realistic equipment, combat hazardous Alaskan waters and become the world's best crab catcher!

    2020IndieAdventureSimulation19.99 USDDeck PlayableSingle-playerSimilar games →
  4. 4
    Harvest Days: My Dream Farm — Steam game cover

    Harvest Days: My Dream Farm

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Adventure with Fish Idle 2: Underwater Mystery.

    Escape the stress of the big city and enjoy the country life. Take care of your farm, explore the open game world and create your farming paradise. Take care of your animals, cultivate the fields, produce useful and decorative items and build your dream ranch.

    2024IndieAdventureSimulation14.99 USDDeck VerifiedSingle-playerSimilar games →
  5. 5
    Salt and Sails — Steam game cover

    Salt and Sails

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Adventure with Fish Idle 2: Underwater Mystery.

    Salt and Sails is a naval combat style game where you control a ship.

    2021IndieAdventureSimulation9.99 USDSingle-playerSimilar games →
  6. 6
    Star Fisher — Steam game cover

    Star Fisher

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Adventure with Fish Idle 2: Underwater Mystery.

    Star Fisher is a top down action fishing game with procedurally generated levels and a simple story to keep you hooked. Dodge monsters and rocks, swing your net, and catch fish to keep your run going and feed your cat!

    2021ActionIndieAdventure2.99 USDSingle-playerSimilar games →
  7. 7
    Docking Ships — Steam game cover

    Docking Ships

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Casual with Fish Idle 2: Underwater Mystery.

    Prepare to embark on a charming and cozy puzzle adventure in Docking Ships a delightful game that combines the charm of pirate ships with the brain-teasing challenge of navigating through a grid tile system to successfully dock your vessels.

    2023IndieCasual0.99 USDSingle-playerSimilar games →
  8. 8
    Quiver Dick's Terrible Tale For Terrible Parents To Read To Their Equally Terrible Children — Steam game cover

    Quiver Dick's Terrible Tale For Terrible Parents To Read To Their Equally Terrible Children

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Indie and Adventure with Fish Idle 2: Underwater Mystery.

    From the creative minds that brought you Metal as Phuk and The Chronicles of Quiver Dick, Crankage Games brings you another hilarious, boner-inducing tale of epic proportions! Embark on a journey as Mary the Fairy, a cannibalistic, foul-mouthed pixie in an even more foul-mouthed world!

    2018IndieAdventure0.99 USDSingle-playerSimilar games →
  9. 9
    War Thunder — Steam game cover

    War Thunder

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required. Shares Free To Play with Fish Idle 2: Underwater Mystery.

    War Thunder is the most comprehensive free-to-play, cross-platform, MMO military game dedicated to aviation, armoured vehicles, and naval craft, from the early 20th century to the most advanced modern combat units. Join now and take part in major battles on land, in the air, and at sea.

    2013ActionSimulationMassively MultiplayerFreeDeck VerifiedSingle-playerSimilar games →
  10. 10
    Butcher hero: hook'n'chew RPG — Steam game cover

    Butcher hero: hook'n'chew RPG

    Single-player alternative to Fish Idle 2: Underwater Mystery — playable solo, no multiplayer required.

    Survival RPG: fight monsters & aliens, upgrade gear, defeat bosses for survival

    RPGSingle-playerSimilar games →