(And Mario 64 is longer than BK, many of the worlds are similar in length if not smaller but 64 has 15 of them and BK has 9, and M64 has other things to do than just the worlds).
Except the last one, its a beast and is easily the longest of the entire series. Its brutal if you're aiming for a deathless run just because of all the ways you can take damage, and the fact that there's a few notes and a honeycomb at the very end that can either severely damage or outright kill you if you screw up.
**** the underwater honeycomb.
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Never underestimate the power of stupidity in numbers. ~War13104
Never stoop to the level of idiots. They will drag you down and beat you with experience.