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Godot Engine - The free and open source 2D and 3D game engine

PNG, or Portable Network Graphics is a common image file format that is lossless, can contain an transparency channel, and compressed. An ideal format for distributing static assets without any loss in quality.

Sprites are generally 2D images used in games to represent objects. They can be animated or static, and come in different styles like isometric or top-down.

Resources for building and relating to User Interfaces, how the user interacts with your program