Super Mario 64: 13-6 Make Wiggler Squirm
You may observe some breakable ground in the pool at the top of the mountain while in small form. Small Mario cannot break it, but if big Mario ground pounds in the pool, it will break and drain the water into the mountain. If you return to the pipe, become small again and go back up, you can enter the mountain through the hole, and thus reach Wiggler. His only attack is charging, and he can be beaten by simply jumping on him three times, so attack with some caution but don't let him intimidate you much.
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