Games like Undarkened
Games like Undarkened include Rust, Don't Starve Together, Palworld, Last Oasis, and Don't Starve. We matched them by the tags players give Undarkened on Steam (Adventure, Indie, RPG, Survival, and Open World): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Survival · Crafting · Open World

Don't Starve Together
Shared: Survival · Adventure · Open World

Palworld
Shared: Survival · Open World · Indie

Last Oasis
Shared: Survival · RPG · Adventure

Don't Starve
Shared: Adventure · Survival · Indie

Terraria
Shared: Survival · Adventure · Crafting

Enshrouded
Shared: Survival · Open World · Adventure

The Forest
Shared: Survival · Adventure · Open World

ARK: Survival Ascended
Shared: Survival · Open World · Adventure

Valheim
Shared: Survival · Open World · Crafting

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

DYSMANTLE
Shared: Survival · Open World · Adventure

Project Zomboid
Shared: Survival · Open World · Indie

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

Hogwarts Legacy
Shared: Adventure · Open World · Magic

Kenshi
Shared: Open World · RPG · Survival

Conan Exiles Enhanced
Shared: Survival · Open World · Crafting

Citadel: Forged with Fire
Shared: RPG · Open World · Survival

Craftopia
Shared: Open World · Survival · Crafting

Necesse
Shared: Open World · Adventure · Survival

The Long Dark
Shared: Survival · Open World · Adventure

ATLAS
Shared: Survival · Adventure · Open World

Starbound
Shared: Adventure · Survival · Crafting

Raft
Shared: Survival · Open World · Crafting