Console modders have made a competition out of creating smaller and smaller portable versions of classic game machines. Gunnar “GmanModz,” an accomplished tinkerer on YouTube, appears to have outdone himself with the “World’s Smallest N64 Portable.” This tiny creation is barely bigger than the original N64 cartridges it can play natively.
Source: “The World’s Smallest Nintendo 64” Trims the Console’s Motherboard to the Bone – Review Geek