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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.

Games that never end. Infinite levels, limitless waves, and unbounded challenges.

Games where you have to manage resources in order to complete objectives. 

Games that can be played using only a mouse or other pointing device, and don't require any other input.