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When jumping over obstacles is one of the main actions, challenges, or mechanics of the game.

16 pixels by 16 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 16x16, they are designed to work in a graphical setting where objects are around that size.

Resources relating to or for building Graphical User Interfaces (Commonly called GUIs)

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.