One avid gamer has built a fully-functional, portable version of Nintendo's beloved fifth generation console, the Nintendo 64. In an era where handheld gaming is increasing in popularity each and every year, fan-made hardware modifications are becoming more relevant than ever before, as they provide gamers with a way to take their retro home console libraries with them on the go. This Nintendo 64 handheld in particular, though, might just be one of the best of these physical mods yet.