From the Super Mario Wiki, the Mario encyclopedia
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A Block Sensor is a rare item in Mario Party DS. They cost twenty coins. It can only be found in a Grab Bag or during the final turns of a 30-turn game when a Grab Bag is also available. When used, on the next Space the player stops, a Hidden Block appears. Inside the hidden block could be anything, such as coins, a Star or even a Ztar.