IMHO.

Single-player games like Monsters sandbox

Below are 12 single-player Steam games similar to Monsters sandbox, 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 Monsters sandbox page.

Ranked picks

  1. 1
    TheDark — Steam game cover

    TheDark

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required.

    Single player and online multiplayer survival game set in a post-apocalyptic open world, With an open world dungeon system

    2022AdventureEarly Access2.99 USDSingle-playerSimilar games →
  2. 2
    Broken War — Steam game cover

    Broken War

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action and Indie with Monsters sandbox.

    Broken War is an intense first-person shooter that combines different multiplayer modes.

    2024ActionIndieMassively Multiplayer0.99 USDSingle-playerSimilar games →
  3. 3
    WASTED Bloodline — Steam game cover

    WASTED Bloodline

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action with Monsters sandbox.

    WASTED Bloodline is a first-person shooter with stunning graphics, singleplayer botmatch mode, online multiplayer, and cooperative play, featuring long-term support.

    2026Action6.99 USDSingle-playerSimilar games →
  4. 4
    Ripper — Steam game cover

    Ripper

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action and Indie with Monsters sandbox.

    Ripper is a top-down shooter with fully destructible environments, fog of war, and Steam multiplayer. Break through walls, survive enemy waves, and battle your friends.

    2026ActionStrategyIndie3.49 USDSingle-playerSimilar games →
  5. 5
    Killing Floor 2 — Steam game cover

    Killing Floor 2

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action with Monsters sandbox.

    In KILLING FLOOR 2, players descend into continental Europe after it has been overrun by horrific, murderous clones called Zeds that were created by rogue elements of the Horzine Corporation. 6-player Co-Op & 12-player VS Zed-slaughtering mayhem.

    2016Action29.99 USDDeck PlayableSingle-playerSimilar games →
  6. 6
    Unreal Tournament 3 — Steam game cover

    Unreal Tournament 3

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action with Monsters sandbox.

    Now includes the free Titan Pack expansion! The Titan Pack gives players a substantial amount of enhanced features and new content, including many original environments, new gametypes, the namesake Titan mutator, powerful deployables and weapons, new characters, and the Stealthbender.

    2009ActionDeck PlayableSingle-playerSimilar games →
  7. 7
    The Haunted: Hells Reach — Steam game cover

    The Haunted: Hells Reach

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action and Indie with Monsters sandbox.

    Winner of 2010′s Make Something Unreal contest, The Haunted: Hells Reach is a fast-paced horror game where your goal is to liberate cursed places and survive the assault of Hell.

    2011ActionIndie8.99 USDSingle-playerSimilar games →
  8. 8
    V Rising — Steam game cover

    V Rising

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action and Massively Multiplayer with Monsters sandbox.

    Awaken as a Vampire. Hunt for blood in nearby settlements to regain your strength and evade the scorching sun to survive. Raise your castle and thrive in an ever-changing, open world full of mystery. Gain allies online and conquer the land of the living.

    2024ActionAdventureMassively Multiplayer34.99 USDDeck VerifiedSingle-playerSimilar games →
  9. 9
    Battleground — Steam game cover

    Battleground

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action and Massively Multiplayer with Monsters sandbox.

    Battleground - A game in the genre of last man standing or royal battle. Fly to the island, find the weapon, get ahead of the enemies and win the round!

    2020ActionSimulationMassively Multiplayer0.99 USDSingle-playerSimilar games →
  10. 10
    Escape from hospital — Steam game cover

    Escape from hospital

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Action and Indie with Monsters sandbox.

    You have to get out of a hospital filled with zombies. In the course of the passage, you need to inspect all the places so as not to miss something important. A large arsenal from knife to flamethrower, but a limited amount of ammunition will make you think about their consumption.

    2021ActionIndie1.99 USDSingle-playerSimilar games →
  11. 11
    Infected spaceship generator — Steam game cover

    Infected spaceship generator

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required. Shares Indie with Monsters sandbox.

    Generator of random mazes with a search for objects, ammunition and weapons. Random placement of enemies such as zombies and mutants, including minibosses. Each new game will be unique.

    2021Indie1.99 USDSingle-playerSimilar games →
  12. 12
    Demolition race — Steam game cover

    Demolition race

    Single-player alternative to Monsters sandbox — playable solo, no multiplayer required.

    Rally style racing with a choice of different cars and tracks. Overtake or push the racers out of the way for victory and advancing! Destruction, collisions, road dust and rock music will accompany you!

    2022Racing0.99 USDSingle-playerSimilar games →