Games like Lern Island Letters
Games like Lern Island Letters include Strange Horticulture, The Case of the Golden Idol, No Case Should Remain Unsolved, The Operator, and Unheard - Voices of Crime. We matched them by the tags players give Lern Island Letters on Steam (Interactive Fiction, Capitalism, Narrative, Relaxing, and Investigation): closest matches first, and among equally close ones the better-known games.

Strange Horticulture
Shared: Mystery · Investigation · Cozy

The Case of the Golden Idol
Shared: Investigation · Mystery · Interactive Fiction

No Case Should Remain Unsolved
Shared: Interactive Fiction · Investigation · Puzzle

The Operator
Shared: Investigation · Mystery · Atmospheric

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

Lost Wiki: Kozlovka
Shared: Investigation · Interactive Fiction · Mystery

Duck Detective: The Secret Salami
Shared: Investigation · Short · Detective

Strange Antiquities
Shared: Mystery · Cozy · Investigation

The Roottrees are Dead
Shared: Investigation · Mystery · Interactive Fiction

The Mermaid Mask
Shared: Interactive Fiction · Investigation · Detective

The Rise of the Golden Idol
Shared: Investigation · Mystery · Puzzle

Gone Home
Shared: Short · Narrative · Atmospheric

Assemble with Care
Shared: Relaxing · Short · Puzzle

Behind the Frame: The Finest Scenery
Shared: Relaxing · Atmospheric · Narrative

Duck Detective: The Ghost of Glamping
Shared: Investigation · Short · Interactive Fiction

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

Cyber Manhunt 2: New World - The Hacking Simulator
Shared: Investigation · Mystery · Puzzle

Contradiction: Spot The Liar
Shared: Interactive Fiction · Investigation · Mystery

The Painscreek Killings
Shared: Investigation · Mystery · Puzzle

Undusted: Letters from the Past
Shared: Relaxing · Short · Cozy

Desktop Explorer
Shared: Investigation · Interactive Fiction · Mystery

Orwell: Keeping an Eye On You
Shared: Investigation · Interactive Fiction · Mystery

Pentiment
Shared: Interactive Fiction · Investigation · Mystery

Kathy Rain 2: Soothsayer
Shared: Investigation · Interactive Fiction · Mystery