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If you didn't know, there are console modders and hackers everywhere who come up with the most amazing creations. As you can see here, a particular individual created a handheld NES console within a Mario Bros./Duck Hunt NES cartridge. How awesome is that? Apparently, it plays a whole slew of 8-bit games in addition to NES games. If you'd like, you can build your very own by reading through this thread on the Ben Heck forums.