Games like Letter Lost
Games like Letter Lost include The Room Three, Sally Face - Episode One, The Room 4: Old Sins, The Room Two, and Little Nightmares II. We matched them by the tags players give Letter Lost on Steam (Mystery, Horror, Story Rich, Dark, and Adventure): closest matches first, and among equally close ones the better-known games.

The Room Three
Shared: Mystery · Adventure · Puzzle

Sally Face - Episode One
Shared: Story Rich · Horror · Dark

The Room 4: Old Sins
Shared: Mystery · Puzzle · Adventure

The Room Two
Shared: Mystery · Horror · Puzzle

Little Nightmares II
Shared: Horror · Adventure · Dark

Poppy Playtime
Shared: Horror · Mystery · Dark

The Room
Shared: Mystery · Puzzle · Adventure

No, I'm not a Human
Shared: Horror · Story Rich · Choices Matter

Little Nightmares
Shared: Horror · Adventure · Dark

Cube Escape Collection
Shared: Mystery · Horror · Puzzle

Outer Wilds
Shared: Mystery · Story Rich · Adventure

Servant of the Lake
Shared: Adventure · Story Rich · Puzzle

SOMA
Shared: Horror · Story Rich · Dark

Fran Bow
Shared: Story Rich · Horror · Adventure

Rusty Lake Paradise
Shared: Horror · Puzzle · Adventure

Bendy and the Ink Machine
Shared: Horror · Puzzle · Dark

The Test
Shared: Story Rich · Simulation · Horror

The Casting of Frank Stone™
Shared: Horror · Choices Matter · Story Rich

What Remains of Edith Finch
Shared: Story Rich · Mystery · Adventure

INSIDE
Shared: Horror · Dark · Story Rich

Underground Blossom
Shared: Adventure · Mystery · Puzzle

Zero Escape: Zero Time Dilemma
Shared: Story Rich · Mystery · Puzzle

Call of Cthulhu®
Shared: Horror · Lovecraftian · Adventure

Zero Escape: The Nonary Games
Shared: Story Rich · Mystery · Puzzle