After you unlock it, you can play Party Mode against Intense level computer ... you have to have unlocked Chomp Romp, Dinger Derby, Flower Shower, Ground Pound, Hydrostars, Later Skater, Leaf ...

Mario Party 5: Coney Island, Night Light Fright, Bill Blasters, Ice Hockey, Squared Away, Later Skater, Dinger Derby, Pushy Penguins, Leaf Leap, Tube it or Lose It. Mario Party 6: Burnstile ...

Mini-Game Decathlon Mini-Game Decathlon is unlocked only after you play the following games in Party Mode: Chomp Romp, Dinger Derby, Flower Shower, Ground Pound, Hydrostars, Later Skater ...