After running from the Tornado followed by going down a set of stairs you will find yourself in a rather large room with a block and on one side a wooden looking platform you should be able to reach.
First of make sure you are in ‘Purple’ form and head towards the other side of the room and inside a small door, here use the Hammer and hit the Block so that it falls to lower levels.
From there drop down and join it, hit it once again with the Hammer, your aim is to push the block to the wooden platform so you can climb it.
The Wind should pick the Block up and lower it onto the other side of the gap, push it so it goes to the high platform
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