From the Super Mario Wiki
Bouncy Maze is an unlockable minigame featured in Yoshi's Island DS. The player controls a Yoshi in a Bouncie-filled maze and must get to the finish line as fast as possible. Timers can be picked up to add an extra second to the time. A Hard Mode can be unlocked by collecting all eight Character Coins in World 3.
Players have 30 seconds to complete a wide and easy path.
In this mode, players are given 60 seconds, but the path is longer, windier, and generally more difficult.
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