Called the KillMii, modder responsible calls it "the worst thing ever." It runs hot, has ten minutes of battery life, but is significantly smaller than two N64s duct-taped together.
Hero builds Nintendo Wii into an Altoids tin - Polygon
This Handheld Wii Portable Fits Inside an Altoids Tin
Random: Modder Builds Fully Functioning Nintendo Wii Inside A Breath Mint Tin
Putting a Wii Portable into an Altoids tin - Boing Boing
Kill Mii: Portable Wii in an Altoids Tin
MintyPi - a Raspberry Pi Zero Gaming handheld inside an Altoids tin
The MintyPi v3 Build Altoids Tin Retro Emulation!
Wii Portable (DS Sized) : r/smashbros
Wii News, Page 2
How to Build a Nintendo Emulator in an Altoids Tin
How to Build a Nintendo Emulator in an Altoids Tin
Make Magazine - Volume 17, PDF