This may not be the first time we've seen a clever modder put Nintendo's N64 console into a handheld version, but it is has to be up there as one of the best.
Made and posted on the Ben Heck forums by modder SifuF, the Nintendo Sixtyfree Lite-R sports all the regular buttons of a standard N64 controller and a 5-inch display taken from a PSOne LCD screen.
Just the small size of it is pretty impressive - measuring not much bigger than an N64 game cartridge that slots in on the back. However, this is also one of its downfalls, as its small framework doesn't leave any room for an internal battery and needs an external battery to run.
All the same, good work SifuF.