There are a few glitches that were fixed when the game was localized overseas, mostly involving pressing opposite directions simultaneously.
• When using Jet Kirby and doing a semi-charged or fully-charged boost in midair, pressing up and down while flying sends Kirby flying diagonally. If Kirby bumps into a wall after a semi-charged boost while holding up and down, Kirby will bounce upwards very fast.
• When using Fire Kirby while doing a running boost in midair, pressing up and down will cause Kirby to shoot down very fast, passing through floors.
• When using Plasma Kirby while holding left and right and pressing up will charge Kirby's plasma beam to the maximum immediately, allowing you to fire fully-charged shots right away.
• When using Yo-Yo Kirby, pressing up, down and Y in midair will cause Kirby to disappear from the screen. If this is done with a helper, the game will act as if the helper doesn't exist.
• Pressing up and down on a ladder causes the game to crash, or could possibly send you to the credits of Milky Way Wishes.