6-6 eh? Hmmmmmmm...
You past the first part yet? that only requires you to roll the Chomp rock until it cannot be rolled anymore.
The second part is a lot harder. First you need a key. At the bottom right section of the chamber, there is an area with three vertical chamber leading up. Fire and Egg into the second one and the key will drop. This is Part 1.
Next you gotta get to the door. There is a parallel chamber with the light background and numbered areas. Go into it on the bottom right door, and go as far upa nd to the left as you can. Go though the door (I can't recall what number it is, I may check tomorrow if you don't get it) and go as far right as you can until you hit a wall. If you are in the right door, you will see a cloud in a small chamber. Hit it with an egg (you gotta bank it off a wall) and a horizontal platform will appear. Then go left and springboard up to the top area, and go back down the breakaway blocks. You will hit the platform you just made, then go right. You should find a locked door, you SHOULD have the key if you listened to me, and that is about it. If you didn't understand it, I can explain it again tomorrow after I play the level through myself.
Just wait till you see level Extra 4. (If you didn't already know, get 100's on the other 8 levels of World 4 to open it)
heh heh heh.... *evil grin*
*My real signature went on strike, said something about "unfair working conditions". So, this is a temporary replacement sig, until I can work things out with the real sig.