Seriously. In the vertical 'pipe' room in Arabian Night (where you fly up a huge shaft with a flying carpet), you can break the floor to the left to reach a hidden area with lots of gems.
Not much of a secret... but apparently Peardian didn't find it, since it's not on the map:
http://vgmaps.com/Atlas/GBA/WarioLand4-SapphirePassage-ArabianNight.png
Note how his map just cuts off there instead of showing the secret passage. Still, I can't blame him. There are literally no clues this room exists, and it's pretty pointless in general.
But yeah, neat that there's an area so well hidden even the maps don't know about it... Pity Youtube massacres the video quality...
Not much of a secret... but apparently Peardian didn't find it, since it's not on the map:
http://vgmaps.com/Atlas/GBA/WarioLand4-SapphirePassage-ArabianNight.png
Note how his map just cuts off there instead of showing the secret passage. Still, I can't blame him. There are literally no clues this room exists, and it's pretty pointless in general.
But yeah, neat that there's an area so well hidden even the maps don't know about it... Pity Youtube massacres the video quality...