Welcome to Yoshi Tower!
From the Super Mario Wiki
Welcome to Yoshi Tower! is the secret level of World 1 in Yoshi's Island DS, and is the first level in which Black Yoshi appears in. The goal is to get to the top of the tower, avoiding obstacles, before the lava catches up to the Black Yoshi.
The level starts in a tower with rising lava and enemies, with a Stork Stop nearby. Yoshi must avoid some more enemies and obstacles, and soon reaches an area with number platforms and even more enemies. Soon after, Yoshi can enter a door in an area with spikes and Zeus Guys to get outside to the goal roulette.
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