If you have the Hand Powers, follow the list of instructions below. If you do not, discontinue reading from this point, as there may be spoilers.
First, you'll need to go to the Castle Town. Then, go to the area that is exactly one screen to the east of Castle Town, and go up to the next area north, where you end up in the area that has a tree that looks like it has a face and a blue crystal-like object(s) next to it. Use Luigi's Thunderhand ability on the crystal(s) to make the fence disappear, and follow the path along its way, and you will eventually reach a cave. Go inside this cave, and you will meet up wih the Hammerhead Bros. again. They will take your hammers, and give you a free upgrade to the Super Hammers!
I hope this helps you out as much as it needs to! If you need more advice, feel free to ask; I'll usually be here to help. : ) --- Search: Valid reasons for being here now. Search Results:No results found. Try again next millennium.