Here is a list of the rarer stickers in the game and how they are unlocked.

  • Boo - Hit a homerun of at least 900 feet in Home-Run Contest
  • Liquid Snake - Defeat ten enemies in Cruel Brawl
  • Phyllis - Clear All-Star Mode on Normal Difficulty
  • Running Chibi-Robo - Clear Classic Mode on Easy Difficulty
  • Ryuta Ippongi - Clear 100 Man Brawl in under 210 seconds