Games like Shape Tunnel
Games like Shape Tunnel include Portal, Portal 2, Unravel, Planet of Lana, and We Love Katamari REROLL+ Royal Reverie. We matched them by the tags players give Shape Tunnel on Steam (Puzzle, Action, Puzzle Platformer, Colorful, and Tactical): closest matches first, and among equally close ones the better-known games.

Portal
Shared: Puzzle · Puzzle Platformer · Singleplayer

Portal 2
Shared: Puzzle · Singleplayer · Puzzle Platformer

Unravel
Shared: Puzzle · Action · Singleplayer

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

We Love Katamari REROLL+ Royal Reverie
Shared: Action · Singleplayer · 3D

COCOON
Shared: Puzzle · Puzzle Platformer · 3D

LIMBO
Shared: Puzzle · Puzzle Platformer · Singleplayer

Tomb Raider I-III Remastered Starring Lara Croft
Shared: Action · Puzzle · Singleplayer

Viewfinder
Shared: Puzzle · Puzzle Platformer · Singleplayer

Human Fall Flat
Shared: Puzzle · Puzzle Platformer · Action

Trine 3: The Artifacts of Power
Shared: Puzzle Platformer · Puzzle · Controller

Defy Gravity Extended
Shared: Puzzle Platformer · Puzzle · Action

Max: The Curse of Brotherhood
Shared: Puzzle Platformer · Puzzle · Action

Chants of Sennaar
Shared: Puzzle · Colorful · Singleplayer

Superliminal
Shared: Puzzle · Singleplayer · Action

Hob
Shared: Action · Puzzle · Singleplayer

Unravel Two
Shared: Puzzle · Action · Singleplayer

Rise of the Tomb Raider™
Shared: Action · Singleplayer · Puzzle

EDGE
Shared: Puzzle · Puzzle Platformer · Action

Darwin's Paradox!
Shared: Action · Puzzle · Puzzle Platformer

Call of Duty®
Shared: Action · Singleplayer · Tactical

Toodee and Topdee
Shared: Puzzle · Colorful · Puzzle Platformer

Seen
Shared: Puzzle · Singleplayer · Action

The Spirit and the Mouse
Shared: Puzzle · Puzzle Platformer · Colorful

