Single-player games like Unknown Signal: Invasion
Below are 12 single-player Steam games similar to Unknown Signal: Invasion, 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 Unknown Signal: Invasion page.
Ranked picks
- 1
Deep Space
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Indie with Unknown Signal: Invasion.
You are entrusted with the role of one of the elite captains, put on a high-tech mech suit suitable for travel into space and go on an exciting journey.
- 2
Magic Ring
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Adventure with Unknown Signal: Invasion.
Magic Ring is an exciting 3D game that takes you on a dangerous journey through the desert to take part in a legendary tournament!
- 3
STAR TALE: Odyssey One
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Indie with Unknown Signal: Invasion.
This is not a rescue mission. No one is coming. This is survival. You awaken alone aboard an infested colony ship carrying the last survivors of humanity. Restore critical systems, manage oxygen, and confront hostile organisms while the AI guiding you seems to be hiding something.
- 4
Unknown Signal
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Indie with Unknown Signal: Invasion.
Unknown Signal is a 3D adventure game. You have received a mysterious signal and you have to find out what or who sent it.
- 5
Mission: Aliens
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Adventure with Unknown Signal: Invasion.
Sergeant, last night we received a signal that an unknown aircraft of extraterrestrial origin had crashed in the taiga. The locals assured us that at the crash site they observed five creatures very similar to humans, only with gray skin and large almond-shaped eyes.
- 6
Galactic Sanctuaries
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Indie with Unknown Signal: Invasion.
Protect the lighthouse, destroy nests and complete tasks.
- 7
Vacuum
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Indie with Unknown Signal: Invasion.
A 3D first-person shooter in which, by chance, an astronaut gets inside the Earth's Moon satellite teeming with various alien creatures. Survive under the intense music in the style of METAL!
- 8
Humanity Lost
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Adventure with Unknown Signal: Invasion.
Will you save humanity? You are on a mission to find a new planet for humans to inhabit. In this story driven FPS space opera you will explore open world planets, find weapons, upgrade your character, and befriend alien species.
- 9
Forest Keeper
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Indie and Adventure with Unknown Signal: Invasion.
Forest Keeper is a 3D logic game with many exciting levels!
- 10
Magic Runes
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Action and Indie with Unknown Signal: Invasion.
Magic Runes - An exciting 3D game with adventure elements. You have to go on a dangerous adventure across a mysterious island full of ancient dinosaurs. Your goal is to cleanse the lands of darkness and return peace and tranquility to these lands!
- 11
Forest Keeper 2
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Indie and Adventure with Unknown Signal: Invasion.
Forest Keeper 2 is a continuation of the first part of the game! Plunge back into a little adventure with the forest guardian!
- 12
Ancient Scroll
Single-player alternative to Unknown Signal: Invasion — playable solo, no multiplayer required. Shares Indie and Adventure with Unknown Signal: Invasion.
Ancient Scroll - the game is a mixture of an adventure game and classic quests. You have to go to an abandoned ranch in search of an ancient scroll. Where an exciting adventure awaits you, hiding many mysteries!