From the Super Mario Wiki
1-2-3 Dice Blocks are a special Dice Block appearing in Mario Party 9. They are green Dice Blocks that only allow the player to roll a one, two, or three. 1-2-3 Dice Blocks can be obtained by landing on a Dice Block Space, a Toad House or on a Spin Space. The 1-2-3 Dice Block can be useful if Mini Ztars are ahead.
1-2-3 Dice Blocks reappear in Mario Party 10.
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