October 14, 2004
One of 9-Volt & 18-Volt's microgames is based on Kid Icarus.
Additionally, the Underworld music from Kid Icarus is featured as an unlockable Record.
WarioWare: Smooth Moves
December 02, 2006
In 9-Volt & 18-Volt's "Opening Night" microgame the player must wave the Wii Remote back and forth to conduct the orchestra. In Level 32 and 3 Pit is featured in the orchestra playing the cello. Additionally the underworld theme from Kid Icarus is sometimes played at Level 3.
Copyrights for both series are held by Nintendo.