Games like Covert X Universe
Games like Covert X Universe include Rust, Last Oasis, Grand Theft Auto V Legacy, Terraria, and Cultivation Tales. We matched them by the tags players give Covert X Universe on Steam (Action, Sandbox, Massively Multiplayer, Third Person, and Building): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Sandbox · Building · Action

Last Oasis
Shared: Massively Multiplayer · Action · Adventure

Grand Theft Auto V Legacy
Shared: Action · Third Person · Adventure

Terraria
Shared: Sandbox · Adventure · Building

Cultivation Tales
Shared: Sandbox · Action · Building

ARK: Survival Ascended
Shared: Sandbox · Building · Action

Warhammer 40,000: Space Marine 2
Shared: Action · Third Person · Adventure

Monster Hunter: World
Shared: Action · Third Person · Adventure

Just Cause 2
Shared: Action · Sandbox · Third Person

Portal Knights
Shared: Sandbox · Adventure · Building

ARK: Survival Evolved
Shared: Building · Action · Adventure

Once Human
Shared: Action · Building · Multiplayer

Scrap Mechanic
Shared: Sandbox · Building · Adventure

Conan Exiles Enhanced
Shared: Building · Sandbox · Massively Multiplayer

Grand Theft Auto IV: The Complete Edition
Shared: Action · Third Person · Adventure

Warframe
Shared: Action · Third Person · Massively Multiplayer

Grand Theft Auto V Enhanced
Shared: Action · Third Person · Adventure

Tomb Raider Game of the Year
Shared: Action · Third Person · Adventure

Judgment
Shared: Action · Adventure · Third Person

Mount & Blade II: Bannerlord
Shared: Sandbox · Action · RPG

Black Myth: Wukong
Shared: Action · Action RPG · RPG

Marvel Rivals
Shared: Action · Multiplayer · Massively Multiplayer

Neverwinter
Shared: Massively Multiplayer · Action · Adventure

LEGO® Worlds
Shared: Sandbox · Building · Adventure