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Godot Engine - The free and open source 2D and 3D game engine

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.

Products that involve or comprise source code, including programming games; does not refer to products with their own source code available, open source or not.