A GTWORLD file contains a world used by Growtopia, an online sandbox game where players can create and destroy objects in unlimited worlds. It stores information about a world, which includes the placement of blocks and items, types of items, and weather that makes up the world.

GTWORLD file open in Cernodile's World Planner GTWORLD files are an important part of Growtopia because gameplay revolves around exploring different worlds. GTWORLD files are typically referenced by Growtopia but they may also be opened and modified by Cernodile's World Planner online. To load a GTWORLD file in Cernodile's World Planner online, select the menu icon in the upper-right corner select Load, and choose the GTWORLD file you would like to open. To save a GTWORLD file in Cernodile's World Planner online, select the menu icon in the upper-right corner, and select Save. The GTWORLD file is then automatically downloaded.