Now that's an impressive way to get through Wario Land 4!

[CM30]

It's tool assisted, but jeez, this is fast:



It's almost like you blink and the level is over. Looks pretty cool though!

 

[Just a Wario Fan]

Speedruns are even more amazing when they are actually played by someone who is not a bot.
But how the hell does he glitch through the wall at 0:46? And the mercyless Catbat killing?

Anyway, here is the fastest non-TAS speedrun I can find:

 

[wariolandgoldpiramid]

But how the hell does he glitch through the wall at 0:46?

It's a well known glitch. Has to do something with wall colition detection being primativly coded