Single-player games like Door2:Key
Below are 15 single-player Steam games similar to Door2:Key, 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 Door2:Key page.
Ranked picks
- 1
Door
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
You will have to face hundreds of different doors, and decide which one you should go to in order to get to the main secret. You have to open the doors in many locations of this world, each of which is dedicated to its type of doors.
- 2
The Witness
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
You wake up, alone, on a strange island full of puzzles that will challenge and surprise you.
- 3
Kairo
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
Enter the lost world of Kairo. Explore vast abandoned monuments. Bring strange and ancient machinery back to life. Slowly uncover the true purpose of Kairo and fulfil a great destiny.Kairo is an atmospheric 3D exploration and puzzle solving game.
- 4
FRACT OSC
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
FRACT is a musical exploration game. You arrive in a forgotten place and explore the vast and unfamiliar landscape to discover the secrets of a world built on sound. You rebuild its machinery by solving puzzles and bring the world back to life by shaping sound and creating music in the game.
- 5
MirrorMoon EP
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
MirrorMoon EP is a game about mystery and exploration set in outer space. These space travels begin on a red planet and its unique moon and extend across galaxies. The single player part of MirrorMoon EP blends adventure and exploration with navigation-based puzzle solving.
- 6
The Vanishing of Ethan Carter
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
The Vanishing of Ethan Carter is a first-person story-driven mystery. Purchase this game to get both the original and the Unreal Engine 4 remaster called The Vanishing of Ethan Carter Redux.
- 7
Obduction
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
A new sci-fi adventure from Cyan, the creators of Myst. Abducted far across the universe, you find yourself on a broken alien landscape with odd pieces of Earth. Explore, uncover, solve, and find a way to make it home.
- 8
SLUDGE LIFE
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
SLUDGE LIFE is a first-person / open-world / vandalism-centric stroll through a polluted island full of cranky idiots and a vibe so thick you can taste it.
- 9
Calculate It
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie with Door2:Key.
We've made a calculator roguelike! Yes, it's not a joke. A boring device has turned into an interesting strategy, where each calculator you collect sets its own style of play. Can you count all the numbers and prove who's the king of calculations here?
- 10
Pandora`s room
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
What would happen if you were in the room, the only thing that will be inside is the mysterious red button? Nothing happened, as long as you do not press it. Your choice determines everything here, because the room is full of secrets, and each key has consequences that will determine the outcome of the game is yours.
- 11
Power of The Void
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
Welcome to Hell! Can you help a little demon escape from hell and go to heaven? He does not want to torture sinners but wants to help lost souls. To do this, he will have to use the power of void and go through hell, purgatory, and paradise, to gain freedom. However, the devil does not intend to give up so simply.
- 12
Golden Key
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie with Door2:Key.
Do you think that officials are greedy and corrupt fools? Congratulations, now you are one of them. You are an official whose daughter was suddenly and deadly sick and needs money for treatment. Will you save your daughter and become a hero for her, or will you be a hero for your people?
- 13
Kalidazkoph
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie with Door2:Key.
Cleaning up in your attic you find strange VHS tapes on which are recorded some experiments. Understand the secrets surrounding these tapes and understand the purpose of the dimension machine.
- 14
Pillow Simulator
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie and Adventure with Door2:Key.
Bored of sheep, flower and stone simulators? Do you want something really different? Meet the pillow simulator!
- 15
Dungen
Single-player alternative to Door2:Key — playable solo, no multiplayer required. Shares Indie with Door2:Key.
A fun roguelike with cards, which differs from the rest in one small detail: for each card you pay with your health. Who will kill you faster, the enemy or yourself?