Nightmare Difficulty

The hardest difficulty, Nightmare Difficulty is unlocked after winning any 4 player party game against Master difficulty. If you are playing by yourself, they will always be your partner in Balance Boat in Wii Party. They also appear at the top of most rankings, excluding Balance Boat Time Attack and Double Up (Beginner and Intermediate) and Solo Mode (Beginner and Intermediate).

The other five CPU Skills are Beginner, Standard, Advanced, Expert and Master Miis: Chad, Gerardo, Hana, Hans, Kumi, Kylie, Neighton, Shizuho, Solomon, Sophie, Sydney & Yuka