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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.

Related to the process of arranging game maps using a set of tile graphics (often call tilesets)

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