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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.

Games where you discover new locations by traveling around in the game's environment

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

A metroidvania is a game inspired by Metroid and Castlevania

It often involves exploration and gaining new abilities to access new areas or progress.