Room 2: You will immediately see the CD Chest, but as you cannot reach it, skip the chest and go up the ladder.
Room 3: Two Spear Masks are guarding the conveyor belts. While there is a Big Diamond at upper left corner, your purpose is to reach upper right corner, and fall down the right shaft with a super stomp to remove the hard block. Before leaving, break the odd block, not only for a bronze coin inside, but also make a shortcut from entrance.
Room 2 (second visit): Again, ignore the CD Chest and move to the right. Roll down the first slope to crush an Ice Yeti. At the second slope, there is an ice platform for slippery test, but you will eventually find the snow pile to become Snow Wario, then use the second slope to clear the path.
Room 4: While there is a Heart at upper path, there is nothing to do to the right. Instead, pick the lower path, take out an Ice Yeti and enter Door A.
Room A: A large room with 8 paths. From top to bottom: The first Stone Chest, a Spear Mask guarding the path to a Big Diamond, a Spear Mask guarding a Heart and another Big Diamond, the return path from above, a Spear Mask guarding the path to Door B, a Spear Mask guarding the Key Ghost, a Spear Mask guarding nothing, and finally, another Spear Mask guarding a Heart. At the left shaft, super stomp the floor to reveal a pipe to Bonus Room 5.
Bonus Room 5: Use the glass balls to deactivate both trigger blocks in order to unlock the Big Diamond below. Stand in front of the wall and make an upper throw to hit the green switch, or jump and toss forward to hit the red one.
Room B: First, move right, climb the web to find a snow pile and clear the bottom floor. Go up the ladder to find the second Stone Chest. From here, roll to the left to break in a hidden portion with a Big Diamond and an Ice Yeti. Continue moving upwards, dodging ice spikes, and finally reach the top floor to find a snow pile at upper left corner. Now return to second floor and start rolling with the only slope making you to the right. You will literally roll upwards and finally stop at Door G.
Room G: Another large room. You will find the third Stone Chest on the right, and the fourth one at bottom left. Pick the longest slope on the left, roll down and quickly jump off to break in a tunnel to reach a Big Diamond, but as soon as getting close to that, jump exactly once more to discover another diamond. Now return to the center and roll down the middle slope on the right, to break in a portion on the left, with a third Big Diamond and two Ice Yetis. Move to the long slope on the left, get Snow Wario and roll down to find a pipe to Bonus Room 6. The fourth Big Diamond in this room is at bottom right. When everything is done, make a snow ball and leave from lower left corner.
Bonus Room 6: Stun the Ice Yeti and bring him to the middle platform above, then let him blow you to pass through the spikes and reach the Big Diamond.
Room 4 (revisited): You come from upper path and will break another path back to Room 2. Go inside.
Room 2 (third visit): It is time to press the Frog Switch and leave. Hurry up! Quickly go up the ladder, get Snow Wario and roll to the left, breaking into Room 7 below. Again, ignore the CD Chest now.
Room 7: Keep falling into Room 8. When you return from below, beware of the Ice Yeti making freezing breath.
Room 8: While collecting frozen bronze coins, take out the Ice Yetis and dodge ice spikes. A Big Diamond is hidden among the blocks. Find the ladder and return to Room 1.
Room 1 (revisited): The exit is near, but in order to collect the CD Chest, return to Room 2 via Room 3, break the block from below, return to Room 1, then crouch into Room 2 and finally take the CD away.
