In and around Peach's Castle. There are some hard enemies to defeat there. :)
You can get Beans, and an SP: Magic Window.
You have to complete the pumpworks level
no
not really
you should definitely get bowsers inside story. It is tons of fun. I LOVE IT!!!!!!!!!!!
on the map
You can only do it with Mario and Luigi. For Mario, press A. For Luigi, press B.
noone
you have to hit the shell block.
By defeating him in battle.
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by eating lots of shrooms