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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

A metroidvania is a game inspired by Metroid and Castlevania

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

Actual NES games or games inspired by the restrictions of an NES.