Games like The Scar
Games like The Scar include No Man's Sky, Subnautica, Fallout 4, The Long Dark, and The Forest. We matched them by the tags players give The Scar on Steam (Adventure, Exploration, Gun Customization, First-Person, and Open World): closest matches first, and among equally close ones the better-known games.

No Man's Sky
Shared: Exploration · Open World · Adventure

Subnautica
Shared: Exploration · Open World · Adventure

Fallout 4
Shared: Exploration · Open World · Adventure

The Long Dark
Shared: Exploration · Open World · Adventure

The Forest
Shared: Adventure · Open World · Crafting

Sons Of The Forest
Shared: Open World · Survival · Exploration

Subnautica: Below Zero
Shared: Exploration · Open World · Adventure

Fallout: New Vegas
Shared: Open World · Exploration · First-Person

Slime Rancher
Shared: Exploration · Adventure · Open World

Rust
Shared: Open World · Crafting · Adventure

Enshrouded
Shared: Open World · Adventure · Exploration

Satisfactory
Shared: Open World · Crafting · Exploration

The Last Caretaker
Shared: Open World · Crafting · First-Person

ARK: Survival Evolved
Shared: Open World · Adventure · Crafting

Stranded Deep
Shared: Adventure · Open World · First-Person

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Open World · Exploration · Post-apocalyptic

Pacific Drive
Shared: Exploration · Adventure · Sci-fi

Dune: Awakening
Shared: Exploration · Adventure · Survival

Terraria
Shared: Adventure · Exploration · Survival

Don't Starve
Shared: Adventure · Crafting · Survival

Valheim
Shared: Open World · Exploration · Adventure

Fallout 3
Shared: Open World · Exploration · Adventure

ASTRONEER
Shared: Open World · Exploration · Adventure

Far Cry® Primal
Shared: Adventure · Open World · First-Person