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Fans generally consider the 4.0.0 update essential, as it addresses early criticisms of the game being too easy.

Kirby Star Allies v4.0.0 update (released November 30, 2018) is the final major content expansion for the game on Nintendo Switch. Often referred to as the "Wave 3" update, it added a significant amount of end-game content and new playable characters. Nintendo Support Key Features of Update 4.0.0

: Added a new "hardest" difficulty level (Soul Melter EX), which includes tougher boss versions and a true final boss. Extra Content