Games like Portals World
Games like Portals World include Terraria, Rust, The Forest, ARK: Survival Evolved, and Don't Starve Together. We matched them by the tags players give Portals World on Steam (Open World Survival Craft, Open World, Tower Defense, Sandbox, and Building): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Open World Survival Craft · Sandbox · Survival

Rust
Shared: Open World · Open World Survival Craft · Survival

The Forest
Shared: Open World Survival Craft · Open World · Survival

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

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

Starbound
Shared: Open World Survival Craft · Sandbox · Survival

Conan Exiles Enhanced
Shared: Open World · Open World Survival Craft · Survival

Raft
Shared: Open World Survival Craft · Open World · Survival

TerraTech
Shared: Open World · Open World Survival Craft · Sandbox

Valheim
Shared: Open World Survival Craft · Open World · Survival

Project Zomboid
Shared: Open World · Open World Survival Craft · Survival

No Man's Sky
Shared: Open World · Open World Survival Craft · Survival

Palworld
Shared: Open World · Open World Survival Craft · Survival

Once Human
Shared: Open World · Open World Survival Craft · Survival

7 Days to Die
Shared: Open World · Open World Survival Craft · Survival

Dig or Die
Shared: Open World Survival Craft · Sandbox · Open World

ASTRONEER
Shared: Open World Survival Craft · Open World · Survival

Cultivation Tales
Shared: Sandbox · Building · Open World Survival Craft

Castle Story
Shared: Sandbox · Building · Open World Survival Craft

Oxygen Not Included
Shared: Building · Survival · Management

Factorio
Shared: Sandbox · Open World · Strategy

Don't Starve
Shared: Open World Survival Craft · Survival · Sandbox

Kenshi
Shared: Open World · Sandbox · Survival

The Long Dark
Shared: Open World Survival Craft · Open World · Survival