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Set in a fictional universe, often (but not always) with fantastic or supernatural elements, alternate worlds, magic and monsters.

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

Featuring gameplay that moves horizontally across a scrolling background, with characters typically walking, running, or jumping from left to right. Often includes platforming elements and side-view perspectives.

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