File this under: custom portable gaming system and/or arcade machine. Instructables user “danny32412” was tired of the bulky NES system, so he used an old cartridge and a special miniature chip to create the ultimate custom console. Video after the break. Click here for more pictures.

This cartridge contains a full NES and can play other NES cartridges. The cart uses a Famicom clone, sometimes called a Nintendo-On-A-Chip, and a few ports drilled into the plastic case.

[via CrunchGearInstructables]