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Focusing on automation and minimal player interaction, idle games let you watch progress unfold over time. Players often engage in occasional interactions like upgrades to influence growth rates or efficiencies, while the game typically accumulates resources autonomously.

A game that has some of or all of the mechanics: Limited interaction or the ability to be played without interaction, rapid growth - often exponential, prestige mechanic(s), An end goal/mission or a general goal of getting a higher amount of currency, and a system of buying and upgrading buildings, units, or similar.

Unity is a game engine for 2D, 3D, AR and more