Instructions
Enter the castle and head toward Wendy Koopa by climbing on the fences to avoid the giant spikes that run along the floor.
Enter Wendy Koopa's chamber by passing through the large blue doors located on a platform above the green warp pipe. Once you reach Wendy Koopa, the room will immediately flood with water; you will have to wait for it to drain before you can attack.
Avoid Wendy Koopa's attacks by dodging the gold rings that she fires at you. These move significantly slower underwater and are always fired at a 45-degree angle. Keep dodging the gold rings until the room drains.
Stomp Wendy Koopa on the head while the room is drained of water to lower her health. Once you stomp her, she will retreat into her shell and zoom back and forth across the floor three times.
Jump to avoid being hit by the shell, while still dodging the gold rings. When Wendy Koopa emerges from her shell, try to stomp on her head before the room floods again.
Repeat the previous steps until you have successfully stomped on Wendy Koopa four times. Once you have defeated her, exit the chamber through the opening in the right-hand wall.