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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.

A style of game where the player must click on something to earn points, which they spend on upgrades to increase the number of points they earn per click, or to increase the number of points they earn over a period of time without clicking.