From WiKirby, your independent source of Kirby knowledge.
Arena Showdown (also simply referred to as The Arena) is a musical piece which first appeared in Kirby Super Star, playing in multiple battles of The Arena.
Kirby Super Star (Ultra)
Arena Showdown is the main battle theme in The Arena, and plays in every Mid-Boss and Boss battle that does not have a unique battle theme.
Kirby Air Ride
The original version from Kirby Super Star can be unlocked as an alternate theme in Sky Sands.
Kirby: Triple Deluxe
A remix of the theme is present in the game, and, like its original appearance, is the main battle theme in The Arena, playing in every battle that does not have a unique battle theme.