Games like Unboxing the Cryptic Killer
Games like Unboxing the Cryptic Killer include The Past Within, Escape Simulator, Tick Tock: A Tale for Two, We Were Here Forever, and We Were Here. We matched them by the tags players give Unboxing the Cryptic Killer on Steam (Puzzle, Online Co-Op, Escape Room, Mystery, and Point & Click): closest matches first, and among equally close ones the better-known games.

The Past Within
Shared: Puzzle · Online Co-Op · Escape Room

Escape Simulator
Shared: Puzzle · Escape Room · Online Co-Op

Tick Tock: A Tale for Two
Shared: Puzzle · Online Co-Op · Adventure

We Were Here Forever
Shared: Puzzle · Online Co-Op · Escape Room

We Were Here
Shared: Puzzle · Escape Room · Mystery

We Were Here Together
Shared: Puzzle · Online Co-Op · Escape Room

The Room 4: Old Sins
Shared: Puzzle · Mystery · Point & Click

The Room
Shared: Puzzle · Mystery · Point & Click

PEAK
Shared: Online Co-Op · Adventure · Co-op

We Were Here Too
Shared: Puzzle · Online Co-Op · Escape Room

Escape Simulator 2
Shared: Puzzle · Online Co-Op · Escape Room

Servant of the Lake
Shared: Puzzle · Escape Room · Point & Click

Escape the Backrooms
Shared: Online Co-Op · Escape Room · Co-op

The Room Three
Shared: Puzzle · Mystery · Point & Click

Underground Blossom
Shared: Puzzle · Escape Room · Adventure

Chained Together
Shared: Online Co-Op · Adventure · Casual

Inside the Backrooms
Shared: Puzzle · Online Co-Op · Adventure

It Takes Two
Shared: Online Co-Op · Puzzle · Co-op

Cube Escape Collection
Shared: Puzzle · Mystery · Point & Click

Rusty Lake Paradise
Shared: Puzzle · Point & Click · Adventure

Gorogoa
Shared: Puzzle · Point & Click · Casual

Storyteller
Shared: Puzzle · Point & Click · Adventure

Castle Crashers®
Shared: Online Co-Op · 2D · Adventure

The Room Two
Shared: Puzzle · Mystery · Point & Click