Games like Unreachable
Games like Unreachable include Sherlock Holmes: The Devil's Daughter, Unheard - Voices of Crime, Return of the Obra Dinn, What Remains of Edith Finch, and The Painscreek Killings. We matched them by the tags players give Unreachable on Steam (Mystery, Detective, Thriller, Puzzle, and Story Rich): closest matches first, and among equally close ones the better-known games.

Sherlock Holmes: The Devil's Daughter
Shared: Detective · Mystery · Adventure

Unheard - Voices of Crime
Shared: Detective · Mystery · Thriller

Return of the Obra Dinn
Shared: Mystery · Detective · Puzzle

What Remains of Edith Finch
Shared: Mystery · Story Rich · Walking Simulator

The Painscreek Killings
Shared: Mystery · Detective · Puzzle

Firewatch
Shared: Mystery · Adventure · Story Rich

The Case of the Golden Idol
Shared: Mystery · Detective · Puzzle

Murders on the Yangtze River
Shared: Detective · Puzzle · Mystery

Sherlock Holmes: Crimes and Punishments
Shared: Detective · Mystery · Adventure

L.A. Noire
Shared: Detective · Mystery · Story Rich

Outer Wilds
Shared: Mystery · Story Rich · Adventure

Danganronpa 2: Goodbye Despair
Shared: Detective · Mystery · Story Rich

Strange Horticulture
Shared: Mystery · Puzzle · Detective

Sally Face - Episode One
Shared: Story Rich · Mystery · Puzzle

Blue Prince
Shared: Mystery · Puzzle · Story Rich

The Operator
Shared: Detective · Puzzle · Mystery

MiSide
Shared: Story Rich · Psychological Horror · First-Person

The Vanishing of Ethan Carter
Shared: Mystery · Detective · Adventure

Murdered: Soul Suspect
Shared: Detective · Mystery · Adventure

The White Door
Shared: Puzzle · Detective · Adventure

Poppy Playtime
Shared: Puzzle · Mystery · First-Person

Raging Loop
Shared: Mystery · Adventure · Detective

The Bridge Curse 2: The Extrication
Shared: Mystery · Story Rich · Thriller

Little Nightmares II
Shared: Puzzle · Adventure · Story Rich