Single-player games like Monster Ops 21
Below are 16 single-player Steam games similar to Monster Ops 21, 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 Monster Ops 21 page.
Ranked picks
- 1
Monster Ops 19
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Simulation with Monster Ops 21.
Season 2 of Monster Ops! Black Ops soldiers Wraith and Tide know the world is against them, and they can only rely on each other. Two soldiers, forced to go rogue, with a desperate mission. There's no one left they can trust. A NSFW Gay Visual Novel Dating Sim put out in Monthly Episodes!
- 2
Monster Ops 20
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required.
Season 2 of Monster Ops! Black Ops soldiers Wraith and Tide know the world is against them, and they can only rely on each other. Two soldiers, forced to go rogue, with a desperate mission. There's no one left they can trust. A NSFW Gay Visual Novel Dating Sim put out in Monthly Episodes!
- 3
Gooning Simulator
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
In this femdom clicker game, your online Mistress takes away your ability to cum, and you’ll have to make enough money gooning to pay for an in person session with her, or else you’ll explode from too much cum!
- 4
Heatwave: Sam's Stay
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
Step into Sam’s shoes and guide him through a summer of self-discovery, complicated relationships, and unexpected desires that will change everything.
- 5
Union Max
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
Union Max is a Gay Adult / Yaoi Visual Novel featuring the adventures of Max, the unlikely hero chosen to be the next ‘Light of the Kosmos'! Join Max on his journey across the Realms of the Kosmos & gather the sparks of Romance, Desire, Angst and Happiness. Reclaim the lost sparks – together as one!
- 6
Time Heals
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
Is more than a visual novel it’s a story of loss, crisis, and resilience. A 19-year-old loses everything, moves, makes new friends, and faces challenges. Family secrets, the Italian mafia, and pro racing on the tracks pull him into a high-stakes game.
- 7
Apocalypse with Femboy
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
You wake with amnesia in a world of monsters. The only clue to your identity is a photograph of a beautiful stranger. Sticking with him may be your only hope for survival… but the greatest danger is the secret he reveals when he falls asleep.
- 8
Sophie: The Girl From The Zone
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie with Monster Ops 21.
Sophie: The Girl from the Zone is a choice-based adult Visual Novel. What if your world was nothing more than a hallucination? What if you were simply insane? In that case, how could you know what is real? And you, are you really who you think you are?
- 9
To Trust an Incubus
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Simulation with Monster Ops 21.
The temp worker Kenta is trapped in a lab with four sexy incubus aliens from another dimension. Kenta dates Incubi, incubi date each other, and even the lab workers can get together! A long gay sci-fi yaoi/bara dating sim loaded with 400 CGs!
- 10
Mister Versatile: A Gay Superhero Visual Novel
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Simulation with Monster Ops 21.
A gay superhero visual novel! The Lone Wolf Mister Versatile thinks super teams are a pain in the ass, but four super-hotties have decided they want to watch his back anyway! Date a villain, a rookie, a symbiote, and a superman-ish alien. Loaded with explicit CGs.
- 11
Morningdew Farms: A Gay Farming Game
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
Sweet southern boy Cody always dreamed of living off the land. Now he's taken over his granddaddy's farm and can begin a wonderful new life in the village of Morningdew--a notorious Gayborhood! Loaded with interactive farming and sizzling gay romance!
- 12
Alpha Hole Prison - A Yaoi, Gay, Bara Visual Novel
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required.
A Gay Prison Visual Novel Dating Sim! Earthling Miguel Santos has been sentenced to life at Alpha Hole, a notorious space prison. His survival depends on using his charms to convince a powerful ally to protect him. A gigantic seven route hardcore gay dating sim loaded with animated scenes!
- 13
My Magical Demon Lover
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
Spicy Ecchi Content + A Yaoi Fantasy Story + A Dash of Comedy = My Magical Demon Lover, a 'mature players' dating sim that puts the wannabe wizard Tristan with his choice of three hot demons.
- 14
Maelstrom: A Yaoi Visual Novel
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
Disgraced soldier Demetri is exiled to Secren, a dangerous world devoid of women. Earthlings are smaller and weaker than the violent men of Secren. Demetri's only hope for survival is to bond with a strong mate who can love and protect him. The heterosexual Italian-American is reluctant.
- 15
Sentimental Trickster: Yaoi BL Gay Visual Novel
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required.
A slice-of-life visual novel with darker twists hiding within! Haru Amari wasn't looking for love, just a new beginning far from his past. Instead he finds himself in complicated relationships where he must decide between his needs and those of the men around him.
- 16
Vampire Slave 1: A Yaoi Visual Novel
Single-player alternative to Monster Ops 21 — playable solo, no multiplayer required. Shares Indie and Simulation with Monster Ops 21.
The world's most ancient vampire, a young & unprepared new leader of a centuries old vampire-hunting organization, thrust together by fate. Thalos knows he's found his beloved, but Dusty must never let himself grow close to a vampire. A kinetic visual novel that grows spicier with each installment!