Games like The Beginner's Guide
Games like The Beginner's Guide include Firewatch, What Remains of Edith Finch, Gone Home, Brothers - A Tale of Two Sons, and Layers of Fear (2016). We matched them by the tags players give The Beginner's Guide on Steam (Story Rich, Walking Simulator, Indie, Atmospheric, and First-Person): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Story Rich · Walking Simulator · Atmospheric

What Remains of Edith Finch
Shared: Story Rich · Walking Simulator · Atmospheric

Gone Home
Shared: Walking Simulator · Indie · Short

Brothers - A Tale of Two Sons
Shared: Story Rich · Atmospheric · Indie

Layers of Fear (2016)
Shared: Walking Simulator · Atmospheric · Story Rich

Before Your Eyes
Shared: Story Rich · Indie · First-Person

The Stanley Parable
Shared: Walking Simulator · Indie · First-Person

Mouthwashing
Shared: Story Rich · Atmospheric · Indie

To the Moon
Shared: Story Rich · Indie · Singleplayer

OneShot
Shared: Story Rich · Indie · Atmospheric

Hellblade: Senua's Sacrifice
Shared: Story Rich · Atmospheric · Singleplayer

That Dragon, Cancer
Shared: Story Rich · Indie · Walking Simulator

A Bird Story
Shared: Story Rich · Indie · Short

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Story Rich · Atmospheric

A Story About My Uncle
Shared: First-Person · Indie · Story Rich

The Talos Principle
Shared: Story Rich · First-Person · Atmospheric

Little Nightmares
Shared: Atmospheric · Story Rich · Singleplayer

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

NaissanceE
Shared: Indie · Atmospheric · Walking Simulator

Antichamber
Shared: Indie · First-Person · Singleplayer

GRIS
Shared: Atmospheric · Indie · Story Rich

Viewfinder
Shared: First-Person · Singleplayer · Abstract

Outer Wilds
Shared: Story Rich · Atmospheric · Adventure

Among the Sleep - Enhanced Edition
Shared: Indie · Atmospheric · Walking Simulator

