Single-player games like Inferno Protocol
Below are 9 single-player Steam games similar to Inferno Protocol, 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 Inferno Protocol page.
Ranked picks
- 1
HAEX
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Inferno Protocol.
An anomaly has been detected in the sub-arctic north. The science team sent to investigate has gone missing. Survive an alien-scarred wilderness solo or with up to 3 friends. Push back the mist, reshape the world, craft weapons and gear, and fight to unearth what happened.
- 2
Subsurface
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Indie with Inferno Protocol.
A 1–4 player co-op underwater horror game where you and your crew descend into the depths, recover valuable resources, meet your quota, and survive whatever lurks below.
- 3
SCP
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Indie with Inferno Protocol.
Infiltrate breached SCP facilities in this tactical co-op horror extraction shooter. Survive surreal anomalies, recover forbidden intel, and escape.. or lose everything. The deeper you go, the stranger and deadlier it gets.
- 4
Lens Of Fear
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Indie with Inferno Protocol.
Realistic, hyper-immersive, intense action-adventure horror game. Developed by PlayableGraph as their debut title. This game combines a portable camera perspective with highly detailed environments and immersive sound design to deliver an authentic horror experience.
- 5
Eternity's Echo: Patient Zero
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Indie with Inferno Protocol.
As Rayne Williams, an elite agent of the D.I.B you were deployed into the zone. Your team is missing and you're surrounded by both paranormal nightmares and mercs. Guided by your partner Sam, you must survive this chaos and uncover the mystery of "Patient Zero".
- 6
Army Troop 2: Modern Guns
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Indie with Inferno Protocol.
Fast-paced old-school military FPS with online PvP, offline PvE, intelligent AI bots, customizable soldiers, and diverse maps. Invite friends to private matches, customize weapons, perks, skins and loadouts, unlock gear, earn killstreaks, and keep one unified Steam Cloud progression.
- 7
Sentinel Trials
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Inferno Protocol.
Classic round based zombie survival game inspired by old school gameplay. Complete Trials, unlock weapons and perks, then hold your ground against the undead.
- 8
SILENT REALM
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Indie with Inferno Protocol.
Free To Play Game, An atmospheric action horror experience set in a non-human realm governed by rules unlike our own. A world of skeletal entities and shifting remains, where forms assemble and decay endlessly, and death exists as an active, hostile force rather than an outcome.
- 9
Phantom Void
Single-player alternative to Inferno Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Inferno Protocol.
Possess enemies, steal their powers, and shape your evolution in a cinematic sci-fi horror set in a collapsing dystopian world. Build your strength through a deep skill tree and physics-based combat.