Games like Portal
Games like Portal include Portal 2, Half-Life 2, Viewfinder, Quantum Conundrum, and Superliminal. We matched them by the tags players give Portal on Steam (Puzzle, Puzzle Platformer, First-Person, 3D Platformer, and Singleplayer): closest matches first, and among equally close ones the better-known games.
Portal 2
Shared: Puzzle · Singleplayer · First-Person
Half-Life 2
Shared: Sci-fi · Singleplayer · First-Person
Viewfinder
Shared: Puzzle · Puzzle Platformer · First-Person
Quantum Conundrum
Shared: Puzzle · Puzzle Platformer · First-Person
Superliminal
Shared: Puzzle · First-Person · Singleplayer
Human Fall Flat
Shared: Puzzle · Puzzle Platformer · Funny
Supraland
Shared: Puzzle Platformer · First-Person · Puzzle
The Entropy Centre
Shared: Puzzle · First-Person · Sci-fi
The Talos Principle 2
Shared: Puzzle · First-Person · Puzzle Platformer
Suicide Guy
Shared: Puzzle · Singleplayer · Comedy
The Talos Principle
Shared: Puzzle · First-Person · Sci-fi
Black Mesa
Shared: First-Person · Sci-fi · Singleplayer
Mirror's Edge™
Shared: First-Person · 3D Platformer · Puzzle
The Turing Test
Shared: Puzzle · First-Person · Sci-fi
A Story About My Uncle
Shared: First-Person · Singleplayer · Puzzle
Planet of Lana
Shared: Puzzle Platformer · Puzzle · Female Protagonist
Defy Gravity Extended
Shared: Puzzle Platformer · Puzzle · Singleplayer
Half-Life
Shared: Singleplayer · Sci-fi · First-Person
Garry's Mod
Shared: First-Person · Physics · Singleplayer
Half-Life: Opposing Force
Shared: Singleplayer · Sci-fi · First-Person
The Ball
Shared: Puzzle Platformer · Puzzle · 3D Platformer
Mirror's Edge™ Catalyst
Shared: First-Person · 3D Platformer · Female Protagonist
Half-Life: Alyx
Shared: First-Person · Singleplayer · Female Protagonist
LIMBO
Shared: Puzzle Platformer · Puzzle · Singleplayer