MarioEX*

Best answer as chosen by Asker / Ratings
Ok to unlock the blue box first you have to have the key to go to the basement to go to the hallway to your right and go in the door. Go right and you will see another door go in it. As you can see the room is flooded with water so you swim in it until you reach the end and go up and you will see a sign that says something like this "It is decided that one shall pound the pillers." You will see two pillers in the room you ground pound them both and all of the water will drain and you will see a metal door go out of it and now you find your self out side of the cassle and most of the water is drained so now you go right and you will find this hole go in it. Now you will be partly invisible(the power of the blue box other in other words)Go down the hill collect the red coins if you want the star in this level. After you are down to the right you will see a blue box but you can't use it yet because you haven't hit the switch so you go left.Turn left again avoid the fire things and go across the yellow bridge watch out as it tilts.Climb up and go stright until you see the lift elvator things(i don't know what to call them) So you see alot of them right so you have to go across the row of diffrent elvator things and one yellow bridge and more elvator things. Now your at the last one be careful not to fall off and jump as high as you can to finnaly be on the other side and now you see a blue switch! You step on it and now the blue boxs are now avialble and if you got all of the red coins there will be a star in a cage like thing and this is the perfect test of the blue cap because with the blue cap you can go right through the cage and get the star!
I hope this helps you