checked-part =>Boss Challenge: Complete the game once and you will be able to play the Boss Mode challenge in the Minigames. =>Sound Test: Complete the game once to unlock the Sound Test. ->Extra Mode: Complete the game with a 100% rating to enable the extra mode, which is a slightly more difficult version of the game. ->Meta-Knight Mode: Complete Extra Mode with a 100% rating to enable this game in the Mini-Game menu. You can now play through the entire game as Meta-Knight.