Stomp on a Koopa, grab their green shell by pressing and holding Y, and then enter their shell by pressing ZL to turn it into a red shell. Red shells allow you to: 🔹 Control the Koopa shell 🔹 Kill smaller enemies 🔹 Break bricks 🔹 Skim over water If you stay into the red shell for too long, you'll eventually exit and become dizzy.