Single-player games like Agent Sirius
Below are 8 single-player Steam games similar to Agent Sirius, 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 Agent Sirius page.
Ranked picks
- 1
少女的求生之路：研究所
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares RPG with Agent Sirius.
2D pixels+beautiful girl+high-definition CG+super rich plot+numerous endings! Put aside the boring and peaceful daily routine, and enjoy the life of sticking with beautiful girls to the fullest in a different world~
- 2
Last Word
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares Adventure and RPG with Agent Sirius.
In a society where having the last word means having power over others, a small party is disrupted by a gentleman who politely issues orders via one-way intercom.
- 3
Unavowed
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares Adventure and RPG with Agent Sirius.
A demon has possessed you and used your body to tear a swath of bloodshed through New York. You are now free, but life as you knew it is over. Your only path forward is joining the Unavowed - an ancient society dedicated to stopping evil. No matter what the cost.
- 4
Corpse Party (2021)
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares Adventure and RPG with Agent Sirius.
Explore the haunted halls of Heavenly Host Elementary in Corpse Party (2021), the horror cult classic now updated for the next generation.
- 5
Zombie Apocalypse Survival Simulator
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares Adventure and RPG with Agent Sirius.
From the creators that brought you The Test Trilogy & many other experiences, comes Zombie Apocalypse Survival Simulator. Will you survive in the new world? Or will you become just another victim to looters, bandits, or worst of all... The Voracious Dead. There's only one way to find out...
- 6
The Test: Secrets of the Soul
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares Adventure and RPG with Agent Sirius.
You will answer a series of questions that will reveal things from deep within. Some will be uncomfortable, but with great knowledge comes great sacrifice. Can you make it all the way through The Test, and are you SURE you want the answers you seek? For it is time to unlock "Secrets of the Soul..."
- 7
Kakuriyo Village ~Moratorium of Adolescence~
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares RPG with Agent Sirius.
Ao & Hinori were both childhood sweethearts & accidentally went to a strange world called Kakuriyo Village. Because of her boyish appearance, the villagers mistakenly thought Hinori was a boy... Can they successfully hide Hinori's genders and escape from the village！？
- 8
Spirit Hunter: Death Mark
Single-player alternative to Agent Sirius — playable solo, no multiplayer required. Shares Adventure with Agent Sirius.
A strange rumor is spreading through the shadows of Tokyo's H City: a mysterious disfigurement has been appearing on the bodies of certain individuals. Anyone who receives the Mark will rapidly die of unknown, horrifying causes. The countdown to death has already begun...