From the Super Mario Wiki
The 4-5-6 Dice Block is one of the Special Dice Blocks appearing in Mario Party 9 and Mario Party 10. It allows the player to roll a four, five, or six only.
This special Dice Block could be obtained by landing on a Dice Space, a Toad House or a Spin Space. The 4-5-6 Dice Block can be quite useful if there are Mini Stars ahead or if it would make the Captain land on a helpful space.
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