Single-player games like S.E.R.T
Below are 8 single-player Steam games similar to S.E.R.T, 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 S.E.R.T page.
Ranked picks
- 1
Something's Out There
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Indie with S.E.R.T.
Something's Out There is a micro-horror creature hunting game, featuring multiple unique creatures across multiple maps. Hunters work together using the tools provided at base or found around the map to track down, hunt, and ultimately kill the creature of which only stories claim exist.
- 2
Operation Athena
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Simulation with S.E.R.T.
Operation Athena is a tactical first-person shooter inspired by classic tactical shooters, with modern mechanics and a more action-oriented pace. Play solo or with up to 4 players as an Athena Team Operator fighting against a global terrorist threat.
- 3
Evil Dark
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Indie with S.E.R.T.
The darkness isn't just atmosphere--it's alive. A co-op survival horror with psychological elements for 1-4 players set in 2030 with deep lore. Survive until dawn, or perform the ritual and leave early. Light is your only defense, but it is never guaranteed.
- 4
Unlock the Three
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action with S.E.R.T.
Unlock the Three is about a Police,Medic,Security Worker and a Father trying to escape from a Monster in locked hospital. Each survivor has its own unique skills to perform and survivors must be collaborate with each other to be able to escape.
- 5
PNEUMA
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Indie with S.E.R.T.
Pneuma is an online co-op sci-fi paranormal investigation experience for up to 4 players. Operate advanced paranormal tech to investigate, analyze, and outmaneuver deadly entities before you are possessed.
- 6
Ukrainian Fight Drone Simulator (UFDS) - FPV drone simulator
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Simulation with S.E.R.T.
Ukrainian Fight Drone Simulator – Starter Edition is a public version of a leading ultra-realistic FPV drone trainer built on lessons from the Ukrainian frontline. Fly combat drones in true-to-life conditions, take on challenges, and feel the adrenaline of modern warfare.
- 7
Alpha Response
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Early Access with S.E.R.T.
From Gooseman, creator of the original Counter-Strike mod - Alpha Response delivers intense police action in dynamic, real-world environments. Fight solo or with friends against diverse enemies in high-stakes missions that demand fast reflexes, teamwork and split-second decision making.
- 8
Obsideo
Single-player alternative to S.E.R.T — playable solo, no multiplayer required. Shares Action and Indie with S.E.R.T.
Obsideo is a 1-4 player online co-op psychological horror, where you and your team of priests explore different locations experiencing paranormal events in an attempt to figure out what ghost they're dealing with and exorcise it from the property.