The True Arena from Kirby's Return to Dream Land. It's basically a boss-rush minigame that you unlock after beating Extra Game in Return to Dream Land. Complete with harder bosses and even a secret boss.

<p><a href="https://www.notessimo.net/page/browse/songs.html/_/video-games/nintendo/the-true-arena-kirbys-return-to-dream-land-r72784" class="onebox" target="_blank" rel="noopener">https://www.notessimo.net/page/browse/songs.html/_/video-games/nintendo/the-true-arena-kirbys-return-to-dream-land-r72784</a></p>\n<p>The True Arena from Kirby’s Return to Dream Land. It’s basically a boss-rush minigame that you unlock after beating Extra Game in Return to Dream Land. Complete with harder bosses and even a secret boss.</p>