Games like CodeX
Games like CodeX include Blue Prince, Outer Wilds, The Talos Principle, Firewatch, and What Remains of Edith Finch. We matched them by the tags players give CodeX on Steam (Adventure, Puzzle, Exploration, First-Person, and Realistic): closest matches first, and among equally close ones the better-known games.

Blue Prince
Shared: Puzzle · Exploration · Investigation

Outer Wilds
Shared: Exploration · Adventure · Puzzle

The Talos Principle
Shared: Puzzle · First-Person · Atmospheric

Firewatch
Shared: Adventure · Atmospheric · First-Person

What Remains of Edith Finch
Shared: Atmospheric · Adventure · First-Person

Indiana Jones and the Great Circle
Shared: Puzzle · First-Person · Adventure

Fallout 4
Shared: Exploration · Adventure · Atmospheric

Riven
Shared: Adventure · Puzzle · Exploration

Quern - Undying Thoughts
Shared: Adventure · Puzzle · Exploration

Stray
Shared: Adventure · Exploration · Atmospheric

Call of the Sea
Shared: Adventure · Puzzle · First-Person

The Witness
Shared: Puzzle · Exploration · First-Person

Myst
Shared: Adventure · Puzzle · Exploration

Portal 2
Shared: Puzzle · First-Person · Singleplayer

Amnesia: Rebirth
Shared: Puzzle · First-Person · Adventure

FAR: Lone Sails
Shared: Adventure · Atmospheric · Exploration

The Painscreek Killings
Shared: Exploration · Puzzle · Investigation

Tomb Raider Game of the Year
Shared: Adventure · Exploration · Story Rich

INFRA
Shared: Puzzle · Exploration · Adventure

Spirit of the North
Shared: Adventure · Exploration · Puzzle

Rise of the Tomb Raider™
Shared: Adventure · Exploration · Puzzle

Red Dead Redemption 2
Shared: Adventure · Story Rich · Realistic

OneShot
Shared: Puzzle · Story Rich · Atmospheric

Return of the Obra Dinn
Shared: Puzzle · Atmospheric · Story Rich