Single-player games like Protocol
Below are 13 single-player Steam games similar to 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 Protocol page.
Ranked picks
- 1
Super Bio-Man
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
Super Bio-Man is the ultimate gunslinger and the guardian of our galaxy. Using his arsenal and metal fist, he shows the invaders from outer space - who's the boss here.
- 2
High On Life 2
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Protocol.
An intergalactic conspiracy threatens the fate of humanity! Team up with a wide cast of talking alien guns as you shoot, stab, and skate your way through the exotic locales to take down the bad guys and save your favorite species (humans)!
- 3
Escape Condition
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
ESCAPE CONDITION is the first FPS that lets you choose how to prepare your city for the catastrophic arrival of AI Superintelligence (EVA). Will you fight EVA alone with AI-powered Cybernetics, or empower the citizens around you to help in the fight?
- 4
High On Life
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Protocol.
HIGH ON KNIFE DLC OUT NOW!! - Humanity is being threatened by an alien cartel who wants to use them as drugs. It’s up to you to rescue and partner with charismatic, talking guns, take down Garmantuous and his gang, and save the world!
- 5
Starship Troopers: Ultimate Bug War!
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
Lock and load into the Starship Troopers universe and join the Mobile Infantry in the most realistic depiction of war ever made! Experience an original story in this action-packed, first-person retro shooter. Would you like to know more?
- 6
Bulletstorm: Full Clip Edition
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Protocol.
Step into the boots of Grayson Hunt after a crash landing on an old resort planet forces him to make a hard choice: survival or revenge. Execute masterful kills with Bulletstorm: Full Clip Edition’s unique combat system that rewards you for performing the most creative and deadly kills imaginable.
- 7
POSTAL 4: No Regerts
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Adventure with Protocol.
POSTAL 4: No Regerts is a satirical and outrageous comedic open world first person shooter and the long-awaited true sequel to what’s been fondly dubbed as "The Worst Game Ever™", POSTAL 2!
- 8
BRAZILIAN DRUG DEALER 3: I OPENED A PORTAL TO HELL IN THE FAVELA TRYING TO REVIVE MIT AIA I NEED TO CLOSE IT
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
A BRAZILIAN BOOMER SHOOTER GAME MADE USING THE ID TECH 2 ENGINE! SHOOT, JUMP, EMBARK ON A JOURNEY THROUGHOUT THE STATE OF RIO DE JANEIRO, HELL AND EVEN HEAVEN! SAVE BRAZIL!
- 9
Loco Parentis / 孤女咒怨
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
Surreal survival horror, where you alone or with a friend have to solve puzzles and try to survive in the endless entrance among the monsters
- 10
Noch
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
Go alone (or with a friend) to find the girl who destroyed the world. An ominous surreal first-person adventure full of dangerous monsters and secrets of the deceased world
- 11
Aliens In The Yard
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
The aliens have decided to steal the Earth's most precious artifacts: your backyard junk. Defend your backyard with fireworks!
- 12
Startup Valley Adventure
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Indie and Adventure with Protocol.
A tough divorce, getting fired from a job ... Why not make your life harder? Take on the role of a novice startup in Silicon Valley. Get ready to dive into…
- 13
Protocol VR
Single-player alternative to Protocol — playable solo, no multiplayer required. Shares Action and Indie with Protocol.
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