Perils of the Perplexing Pyramid is the special level of World 2 in Yoshi's Woolly World it unlocked after collecting all 40 Smiley Flowers in the previous eight levels.
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The level starts with a night scene, leading into a pyramid with a few Shy Guys. After a cannon launch, Yoshi must eat and spit out a Koopa Shell to be moved to a platform above with a red ! Switch. After moving across the blocks, Yoshi must then catch the shell before it careens off to an unreachable point, then spit it out again before the red ! switch wears off to hit a yellow ! switch. This reveals a key, which allows Yoshi to access the locked door. The second room, if backtracked from the access point, starts with a Tap-Tap spawning area. Yoshi must get it across the hole until it hits another red ! switch, followed by another, until it finally reaches a yellow ! switch, revealing the key and allowing access to the next room. The third room consists of a Monty Mole spawning area. Yoshi must guide the Monty Mole across many lifts to yet another yellow ! switch, leading to another door. The fourth room at first consists of coffin with a single Pharaoh Guy coming out of a lift. A nearby flame must be eaten and spit out at it to defeat it for good. After this, a cannon will spawn, sending Yoshi out of the pyramid and back into the open. The goal ring awaits.