Most optical mice are boring, not this one. To make your own, you’ll need an NES controller, optical mouse, dremel tool, lots of glue, soldering gun, and four-five hours. Video demonstration after the jump.
I considered putting the scroll wheel in because i really prefer my mice with them. It could be done fairly easily but i wanted to keep the form factor. The wheel would have come out right between the red buttons and the “Nintendo” logo. Using the controller you put your palm over the 4 way control and your index finger on the A button