3-1: Entering Cushy Cloud
You will fall into a rocky area. Defeat the Biospark, Waddle Doo, and Waddle Dee. Slide (and roll) past the Wall Spitty and take out the Snooter. Slide (and roll) past another two Wall Spitties and defeat the Waddle Dee and Snooter. Defeat the Waddle Dee, Big Waddle Dee, and Cupie. Cross the platforms while taking out two Scarfies and a Waddle Doo. Enter the door and take down the two Blue Floaties, Inedible Ooze, and Cloud Bomber (perfect place for him if i say so myself). After falling down the disintegrating blocks, you will encounter a Snooter guarding some meat. Be sure to take it out if you want to heal up. Finally, the bottom of the area contains the door and a 3rd of a 1-UP. After entering the door, be sure to eat the laser ball to gain the laser ability which will be required for the next chest. At the end of the first corridor in this new area, hit the suspicious-looking star block to find a slope. Shooting this slope will allow lasers to hit the above blocks to reveal a thin corridor leading to another 3rd of a 1-UP and a chest. At the end of this area, you will come across a bunch of star blocks. Instead of firing straight threw them to find the regular door, hit the ones in the top right area to find a secret door leading to the last 3rd of the 1-UP and a throw bubble (you will need this soon). Going through the door will lead you to a crystal area. After fighting the Sword Knight and Snooter, you must go down a ladder. Here you will find an Acchi who you DO NOT KILL. Use your throw bubble and throw the Acchi to break the metal blocks behind it. Here you will find your next chest. After that, go down the ladder, kill the two Noddy, and go through the door to the next area. After adventuring through the door, you will come across a lone Squeaker holding the final chest. Kill it. After stealing the chest from the poor, innocent Squeaker, run as quickly as you can as Spinni will try to catch you. The exit door is near here, so it should not be too much trouble to get there without getting hit.
3-2: Aqua Time
You come across a beachy area with a Pengy you can use to gain the Ice ability. Use your newfound ice powers to create ice along the water to get through this section. Upon entering the door, you must dive into the water. In the water, you must attack some Blippers and use your water attack to hit a bomb block leading to the area with the next chest. This area gives you the next chest at the bottom of some disappearing blocks. Collect the chest, leave through the door you came through, and take the next door to a new area. Here, you have the choice of taking the Beam or Spark ability for the upcoming mid-boss fight. Obviously take Beam, because Spark is usually worthless in boss battles (unless you have the ability scroll). This boss battle will be against Boxy (or Tedhaun if you have the ghost medal). Boxy is pretty aggressive, so be sure to be on guard the entire fight. It does not matter much whether you take its ability or not, but Magic is always fun. Run past the Perara and enter the door to the next area. This area has nothing special but a booby-trapped pep brew if you would like, so I'll skip over it. This next door will contain the last chest which is guarded by everyone's favorite UFO-riding squeaker with glasses, Doc. If you have no ability, quickly use the Waddle Doo in the top left of the area to get Doc before he enters his base. If you still have Magic, use it to disable Doc quickly and nab the chest. After that, you should have no problem getting out as the door is just a little to the right.