Games like Conundrum
Games like Conundrum include OneShot, INSIDE, Little Nightmares, Papers, Please, and COCOON. We matched them by the tags players give Conundrum on Steam (Puzzle Platformer, Adventure, Puzzle, Multiple Endings, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

OneShot
Shared: Pixel Graphics · Puzzle · Story Rich

INSIDE
Shared: Puzzle Platformer · Atmospheric · Adventure

Little Nightmares
Shared: Adventure · Puzzle Platformer · Atmospheric

Papers, Please
Shared: Pixel Graphics · Multiple Endings · Puzzle

COCOON
Shared: Adventure · Puzzle · Puzzle Platformer

Return of the Obra Dinn
Shared: Puzzle · Mystery · Atmospheric

Outer Wilds
Shared: Adventure · Puzzle · Mystery

ANIMAL WELL
Shared: Puzzle · Puzzle Platformer · Pixel Graphics

The Room Three
Shared: Puzzle · Adventure · Mystery

Little Nightmares II
Shared: Adventure · Puzzle · Atmospheric

Portal 2
Shared: Puzzle · Puzzle Platformer · Singleplayer

The Talos Principle
Shared: Puzzle · Atmospheric · Adventure

Blue Prince
Shared: Puzzle · Mystery · Adventure

The Rewinder
Shared: Adventure · Puzzle · Pixel Graphics

The Last Campfire
Shared: Adventure · Puzzle · Atmospheric

LIMBO
Shared: Puzzle Platformer · Puzzle · Adventure

Firewatch
Shared: Adventure · Atmospheric · Story Rich

The Room
Shared: Puzzle · Adventure · Atmospheric

Chants of Sennaar
Shared: Adventure · Puzzle · Atmospheric

Stray
Shared: Adventure · Atmospheric · Puzzle

Seen
Shared: Adventure · Puzzle · Puzzle Platformer

INMOST
Shared: Adventure · Pixel Graphics · Puzzle Platformer

FEZ
Shared: Puzzle · Pixel Graphics · Adventure

Murders on the Yangtze River
Shared: Adventure · Puzzle · Puzzle Platformer