Unlock castle's basement levels for Super Mario 64 DS - Nintendo DS

• Unlock castle's basement levels

After you have unlocked Mario, go outside and do the glitch where you climb down the tree into the water, but make sure the moat has not been drained yet. Also, make sure you have not defeated the first Bowser. Swim down low and go to the metal door that takes you into the castle basement. Do not swim too high or you will be above the floor of the moat and have to start again. Go around to the back side of the door and swim through it. You will hear the sound that usually plays when you jump into a painting. You will be in the basement and walking underwater. Walk forward and get out of the water. All of the castle's basement levels are now open. If you drain the moat, you can come and go freely without unlocking the door to the basement. You can probably unlock the door to the upper levels of the castle before or without unlocking the door to the basement.

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