On October 22, 2012, Hommel uploaded a video to his YouTube channel showing the development of the game before its release. The game's user interface started to take shape with Hommel's mockups. Production of Growtopia started in 2012, when designer Seth Robinson made six mockup screenshots outlining the premise of the game of which he originally called Buildo, and sent it to Mike Hommel to entice him into helping with the project. Locks also act as the main form of tradable currency. When a player has locked an area, they can allow other people to interact with the area by giving them access through the lock.

The game also contains types of locks that change certain aspects of how the world functions. Players can lock areas by using different sizes of locks: Small Lock, Big Lock, Huge Lock, and World Lock (there are also other types of locks such as Diamond Locks, which have the same function as World Locks). Players cannot interact with the world if it is locked by someone else. Players can break and build blocks, get seeds or gems from blocks, plant seeds, and harvest trees. Worlds in Growtopia have the same size, with the exception of some worlds created by the original developers (such as the world Tiny). When a player creates a new world, the world will be procedurally generated. Players can visit other people's worlds or create their own. Once they have finished the tutorial, they are sent to a world called Start so that they can learn more about the game. The player starts out with two basic tools: a fist for punching and breaking blocks and a wrench for editing block properties. When a new player joins, they are sent to a private world called Tutorial, which teaches them the basics of the game by giving them quests through an item called the Growpedia. The game has no end goals or 100% completion, however, there is an achievement system and quests to complete from non-player characters. Growtopia is a 2D massively multiplayer online sandbox video game based around the idea that most of the in-game items can be grown from seeds of trees.

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