This is how you can drain the moat outside of the castle in Super Mario. You have to first go into the room that is located next to the hazy craze maze and jump into the water. Jump into the water and surface by the two columns. You have to then pound the two columns down. The moat will then drain.
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You can't. Once you drain it by pounding the pillars, You can't flood it again.
A 'moat'
farty
Buttstomp two pillars in the basement of the castle. They can be found behind one of the doors in the basement Adding on: If you can't find them you go to the underwater passage and stomp the giant platforms. :)
It is just outside the inner castle wall, by the kitchen. The kitchen is in the north-eastern portion of the castle.