This awesome NES casemod might be one of the smallest ever. The builder managed to squeeze a fully-functional NES console into the body of a single NES game cartridge. The Fami-Card began life as an original Super Mario Brothers cartridge. French modder Kotomi went to town and ripped out the guts, transplanting them with the innards of a NOAC (NES on a Chip) system clone.

This new small console has an NES cartridge slot, power and reset buttons, a pair of joystick ports and composite video and stereo audio outputs. It’s pretty amazing seeing a cartridge play a cartridge.