Single-player games like Probation Protocol
Below are 15 single-player Steam games similar to Probation 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 Probation Protocol page.
Ranked picks
- 1
Aghia
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
The Dark Voievode has unleashed his beasts to violate your homeland. Eradicate these creatures from the face of the Earth as you make your way across the country in this ’90s-inspired FPS.
- 2
MEGAPAIN
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
A dynamic retro shooter with intense arena battles and co-op mode! Gear up with pistols, assault rifles, and rocket launchers to annihilate hordes of mutants solo or with friends. Every arena is a new challenge, every firefight is pure action! Inspired by the FPS shooter legends of the '90s-'00s.
- 3
Who Wants to Rule the World
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
A run-based FPS where the goal is simple: survive eight rounds of intense combat. Each round is a choice between how much you earn for upgrades and the number of enemies you'll face. Growth vs survivability.
- 4
CARNAL
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
CARNAL is a fast and challenging retro FPS straight from the mid '90s. The Sons of Anak are opening portals to extract Dark Matter from the "other side". Combat the possessed soldiers, the manifested demons helping them, and any inanimate objects standing in your way!
- 5
Quake
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
Developed by the award-winning id Software, Quake® is the ground-breaking, original dark fantasy first-person shooter that inspires today’s retro-style FPS games. With Quake (Enhanced), experience the authentic, updated, and visually enhanced version of the original.
- 6
DUSK
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
Battle through an onslaught of mystical backwater cultists, possessed militants & even darker forces as you attempt to discover just what lurks beneath the Earth in this retro FPS inspired by the '90s legends.
- 7
Nightmare Reaper
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
Blast through a cursed nightmare solo or with up to 3 friends. A retro-inspired FPS where looter shooter weapons meets boomer shooter chaos and rogue-lite elements.
- 8
Blood™ Fresh Supply
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
Battle an army of sycophantic cultists, zombies, gargoyles, hellhounds, and an insatiable host of horrors in your quest to defeat the evil Tchernobog. Squirm through 42 loathesome levels filled with more atmosphere than a Lovecraftian mausoleum.
- 9
The Resistance
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
You have one chance. One chance to save the resistance. Fight, that is what you have been taught your whole life, that there was never an end to war, but this could be it. This could be the last factory to destroy, this could save the world. And only you can do it.
- 10
Dark Matter
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
The Space Pirates are planning on destroying the Earth. They have stolen many space cargo vessels in order to gain the supplies to blow it up. You play as Dark Matter, a hired bounty hunter who works with the Space Federation in order to stop the pirates. You must stop the pirates, save the space cargo vessels, and save the Earth.
- 11
Galaxy in Peril
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
The galaxy is in peril. The aliens have teamed up with the smartest robots in the universe in order to take the galaxy for their own trade. You play as a bounty hunter who is looking for the money, and trying to save his own galaxy where he was born and raised.
- 12
Galaxy in Peril: Time Trouble
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
The galaxy is in peril again. Falias forces have made it back to your galaxy, and want to harvest the energy from your star! The only way to stop them is to go back in time using a newly discovered blackhole. Go back in time, disable the devices, and save your galaxy!
- 13
MY TIME ALIVE
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
In 2023, industry leading pharmaceutical company "HT Pharmaceuticals" found the complete cure for COVID-19, and they released the vaccine to the public. 9 months later, not much is left of mankind. Complete supply missions and conduct research studies to help find the cure to the infection.
- 14
Deliver or Die!
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
Deliver or Die! is an arcade game based on many classic ideas put together. With a bomb strapped to your car, time is of the essence. Collect deliveries, collect powerups, drop off the deliveries, and make sure they are on time... or you DIE!
- 15
Truth Seekers
Single-player alternative to Probation Protocol — playable solo, no multiplayer required. Shares Action with Probation Protocol.
Truth Seekers is a class-based horror multiplayer cooperative shooter game centered around hunting urban legends and folklore monsters. Find and craft items to aid in your attack, all while strategizing with others to learn the monsters' behaviors before they learn yours...