Bowser Dice Block
From the Super Mario Wiki
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A Bowser Dice Block is a Dice Block appearing in Mario Party: Island Tour. It only appears in Bowser's Peculiar Peak, where it replaces the normal Dice Blocks. The player can get bonus Bowser Dice Blocks by placing 2nd (Bronze), 3rd (Silver), or 4th (Gold). These usually hinder the player by providing more blocks to roll, but if doubles are rolled, the player will stay where they are.
In Mario Party 10, a different version of the Bowser Dice Block appears in Bowser Party mode, being green with black trim and red dots on its faces. Bowser uses them to move across the boards in his attempts to catch up to Team Mario. He normally has as many Bowser Dice Blocks as there are members of Team Mario, but certain events and spaces can make him gain or lose blocks.
At the homestretch of Chaos Castle's Bowser Party mode, Bowser fuses all of his Bowser Dice Blocks to create the Super Bowser Dice Block, a dreadful version of the Bowser Dice Block which has a Bowser mark instead of a one; when it lands on the Bowser mark, Bowser instantly catches up to Team Mario.
In Super Mario Party, another Bowser Dice Block appears, but white with a green trim. When playing on a board, when players have Bowser in the party, he can roll a 1, 8, 9, or 10, but the Dice Block has two -3 coin slots that can subtract three coins without adding any numbers to the total roll This acts like Wario's Greedy Dice Block and Waluigi's Risky Dice Block which both subtract coins, but it with higher numbers and riskier odds than Risky Dice Block.