Games like The Bird's Realm 3
Games like The Bird's Realm 3 include SpaceEngine, Garry's Mod, Bloons TD 6, Goat Simulator, and Slime Rancher. We matched them by the tags players give The Bird's Realm 3 on Steam (Casual, Sandbox, Flight, 3D, and Singleplayer): closest matches first, and among equally close ones the better-known games.

SpaceEngine
Shared: Casual · Sandbox · Open World

Garry's Mod
Shared: Sandbox · Casual · Singleplayer

Bloons TD 6
Shared: Singleplayer · Casual · 3D

Goat Simulator
Shared: Sandbox · Casual · Open World

Slime Rancher
Shared: Singleplayer · Open World · Sandbox

PowerWash Simulator
Shared: Casual · Sandbox · 3D

The Scroll of Taiwu : Beyond The Dome
Shared: Sandbox · Open World · Singleplayer

Goat Simulator 3
Shared: Sandbox · Open World · Casual

Aviassembly
Shared: Flight · Sandbox · Open World

X-Plane 11
Shared: Flight · Open World · Singleplayer

Scribblenauts Unlimited
Shared: Casual · Sandbox · Singleplayer

Avorion
Shared: Sandbox · Flight · Open World

Superflight
Shared: Flight · Casual · Singleplayer

SPORE™
Shared: Sandbox · Open World · Casual

Stormworks: Build and Rescue
Shared: Sandbox · Open World · Flight

The Crew Motorfest
Shared: Sandbox · Open World · Singleplayer

My Time at Portia
Shared: Casual · Open World · Singleplayer

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Singleplayer · 3D

Slime Rancher 2
Shared: Singleplayer · Open World · Casual

Microsoft Flight Simulator 2024
Shared: Flight · Sandbox · Singleplayer

House Flipper
Shared: Singleplayer · Sandbox · Casual

Train Simulator Classic
Shared: Singleplayer · Casual · Open World

SUMMERHOUSE
Shared: Sandbox · Casual · Singleplayer

X4: Foundations
Shared: Sandbox · Open World · Flight