Really Rolling Hills

Really Rolling Hills, or World 2-4, is the tenth regular level of Super Mario 3D World and the fourth one in World 2. It is unlocked via completing Puffprod Peaks or Shadow-Play Alley, and its own completion unlocks Big Galoomba Blockade.

Layout
This level takes place in a large grassland, inhabited by Skipsqueaks and Galoombas. It has many hills that are constantly rotating. The level also features Baseballs. After the checkpoint, the player goes into an underground mine, and all the Skipsqueaks have spikes on themselves.

Green Stars

 * Green Star 1: Near the very beginning, the player must use the Cat form to climb a cliff between two clear pipes.
 * Green Star 2: During the underground portion of the level, there is a green Warp Pipe that's partially blocked by purple Brick Blocks. The pipe leads to an odd room with tiles that, when all activated, will reveal the second Green Star.
 * Green Star 3: After the second star, the player must fall between the rotating wheels to find the third Green Star.

Stamp

 * Near the beginning, there's a switch that only Mario can activate. That switch reveals the stamp.

Enemies

 * Skipsqueaks
 * Galoombas
 * Micro-Goombas
 * Spiny Skipsqueaks
 * Goombas