How do I get into the room with the star above it?

Question

In Vegetable Valley, above the room where you fight the tree boss, there is a door with a Star above it (it is circled in yellow in the picture below). For me, this room is all boarded up. How do I get inside?

Answer

This is a Warp Room. Unlike, say, Return to Dreamland, there isn't a world map that you can just access each level. Instead, the boss door is a doorway that leads to the next level, once you beat the boss. Travelling is done by simply walking.

The Warp Room is a method for accessing different levels without needing to walk across each of the intervening levels. Each one you unlock adds a new warp star in it that you can use to access a different level. They're always unlocked next to the boss door.

Until you have at least two Warp Rooms, however, you don't have a destination! So it'll be boarded up until you can actually use it, which is when you unlock the second Warp Room.

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