The game Yahtzee consists of 14 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 14 scoring categories, and each must be used for one of the 14 rounds. This often results in a zero score for some categories.
The 14 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
13. Chance: Any combination -- points equal the sum of all 5 dice
14. Rigole: 4 times the same number and 1 time the opposite number on a dice (Ex. 1-1-1-1-6, 2-2-2-2-5, 3-3-3-3-4, 4-4-4-4-3, 5-5-5-5-2, 6-6-6-6-1)