This level takes place inside a giant toy house. You'll be jumping across building blocks, avoiding toy soldiers, and navigating through pipes that look like giant straws. The toy soldiers (Toy Soldiers) march back and forth and can be tricky to jump over due to their height. A well-timed Superball can take them out. There are also sections with bouncy springs that launch Mario high into the air, requiring you to quickly adjust your direction to land on the next platform. Look for a hidden Carrot power-up early in the level; it will make the spring sections much more manageable by allowing you to float and control your descent.
Secret: There's a hidden pipe near the end of the level that leads to a bonus room with many coins. To find it, look for a small gap in the ceiling after the last set of bouncy springs.