The game Yahtzee consists of 13 rounds. In each round, you roll 5 dice and then score the roll in a different category of your choice.

During a round, you can roll the dice up to three times before scoring -- the initial roll (in which you must roll all the dice), plus two optional re-rolls of any or all dice.

There are 13 scoring categories, and each must be used for one of the 13 rounds. This often results in a zero score for some categories.

The 13 scoring categories are as follows:

1-6: There is one category for each number on the die. In these categories, the score is the sum of the pips on the dice of that number. For example, a roll of 1-1-2-5-5 could be scored as 2 points in the "ones" category, 2 points in the "twos" category, 10 points in the "fives" category, or 0 points in the "threes," "fours," or "sixes." If a player scores a total of at least 63 points across these six boxes, a bonus of 35 points is added.

7. Three-Of-A-Kind: At least three dice showing the same face -- Points equal the sum of all 5 dice (not just the 3 of a kind) 8. Four-Of-A-Kind: At least four dice showing the same face -- Points equal the sum of all 5 dice (not just the 4 of a kind) 9. Full House: A three-of-a-kind and a pair -- 25 points 10. Small Straight: Four sequential dice 1-2-3-4, 2-3-4-5, or 3-4-5-6) -- 30 points 11. Large Straight: Five sequential dice (1-2-3-4-5 or 2-3-4-5-6) -- 40 points 12. Yahtzee: All five dice showing the same face -- 50 points (plus, once you have scored 50 pts for a Yahtzee, a 2nd Yahtzee gives a bonus of 100 points) 13. Chance: Any combination -- points equal the sum of all 5 dice