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Uses two-dimensional "sprites", 2D images created and used on a flat plane, as opposed to the three-dimensional models or environments found in 3D games.

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

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

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.