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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. 

In the style of games made the 8-bit generation of game consoles & computers, or sometimes authentically created to run on original hardware. Common 8-Bit consoles include the Nintendo Entertainment System, Sega Master System, and the Commodore 64

For that old school look and feel.