After unlocking The Ultimate Choice Game Mode in Kirby Star Allies, you will instantly be able to choose between five levels of difficulty by default. However, there are actually three addition difficulties that can further be unlocked. By completing both Guest Star ???? Star Allies Go! and The Ultimate Choice just once, you will unlock the difficulty levels of Fiery Showdown and Infernal Crisis. Should you successful defeat the difficulties of Fiery Showdown or Infernal Crisis in The Ultimate Choice, you will further unlock the Soul Melter difficulty.