Really Rolling Hills gets its name from having hills that are actually rolling in place throughout the level. Often enemies are on or near them, such as Galoombas or Skipsqueaks.
Stamp
Fairly close to the start point for this level is a Character Switch surrounded by a small pool of water. You must be Mario to hit this switch, and doing so grants you the Stamp for the level. Not a bad way to start things off!
Green Star #1
North of the Character Switch is a hill. You need the Cat Power-Up to reach the top. The first Green Star is located there. If you’re big, you can find a Super Bell in an ? Block atop one of the rolling hills close by.
This field is filled with Coins, Galoombas, and rolling hills. You can find tons of Coins hidden on the walls on the sides of the field, and under one of the rolling hills you can even find a 1-Up Mushroom. Don’t dally too long, even with the long time limit for this level. You want to hit the catacombs later in the level with enough time to make sure you can collect the last two Green Stars.
The catacombs you enter shortly after the Checkpoint Flag are split into multiple levels, which means you’ll have to work fast to reach the last two Green Stars. The Cat Power-Up is very useful, so try to have one equipped!
Green Star #2
If you take the lower route in the catacombs, watch yourself while getting around the Spiny Skipsqueaks, then crawl under the Crystal Blocks (or smash your way through them) to reach a pipe that takes you to a bonus room. Your goal there is to light up all of the floor panels either by walking or jumping on them, or by kicking one of the baseballs on the floor around. Luckily there’s no time limit. Do this, and get your second Green Star!
Green Star #3
The last Green Star is in a deceptive location. As you proceed through the catacombs, you encounter a trio of rolling hills that are placed over what appears to be a bottomless pit guarded by a pair of Spiny Skipsqueaks.
Drop down below these rollers. At the bottom of this pit is several ? Blocks and the last Green Star. Take the pipe to escape the pit, and you arrive next to the catacombs exit. The Goal Pole is close by! Clearing 2-4 unlocks 2-A.