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When jumping over obstacles is one of the main actions, challenges, or mechanics of the game.

Games that challenge the player with critical thinking to solve levels. 

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.

A metroidvania is a game inspired by Metroid and Castlevania

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