What is the keepers section?

After you roll the dice at the start of a round, you might want to set some of the dice aside and only roll the remainder as you try to improve your score.  For example, let's say it is late in a game and you really need to enter a good score for Fours.  If on your first roll you only get one Four, you can click on it to move it to the "Keepers" section (see image below).

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When you click "Roll" for the second time, only the four remaining dice will be rolled. If you get more Fours, you can click on them to move them to the Keepers section as well and then make your final roll.  If you change your mind about a die you moved to the Keepers side, you can click on it to return it back to the right.