64DD

The 64DD (often referred to as the Nintendo 64DD) was an add-on for the Nintendo 64, released exclusively in Japan on December 1, 1999 after being announced four years prior. A little over 15,000 units were sold and only nine games were made for it, making it a commercial failure.

Games List

 * Mario Artist: Paint Studio
 * Doshin the Giant
 * Mario Artist: Talent Studio
 * SimCity 64
 * F-Zero X Expansion Kit
 * Japan Pro Golf Tour 64
 * Doshin the Giant: Tinkling Toddler Liberation Front! Assemble!
 * Mario Artist: Communication Kit
 * Mario Artist: Polygon Studio

Purpose
The whole purpose of the 64DD was to play online games. The 64DD plugged into the underside of the Nintendo 64, where the extension port is.