From the Super Mario Wiki, the Mario encyclopedia
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A Puzzle Room is a room found in the Game Boy Advance game Wario Land 4. It is a room where Wario can collect a Diamond, or a combination of 1,000 points (only if the player solves a puzzle before-hand). They are found in a Purple Pipe, and there are two in each level, not including the Entry Passage and the Golden Passage. The puzzles vary in difficulty, depending on how far Wario has progressed in the game. For each puzzle, Wario must work out a way to obtain the Giant Diamond, or the 1,000 points. For example, in the picture on the right, Wario must throw Arewo Shitain-hakase to hit the ! Switch and activate a set of stairs. Wario will then be able to reach his prize of a Giant Diamond.
Solving these rooms is optional, and is not necessary to completing the main game, but rather if the player wanted to gain a few extra points. A soundtrack plays every time Wario enters a Puzzle Room. The Sound Room record Soft Shell is a remix of the Puzzle Room soundtrack.