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Yahtzee Rules

Object

Finish with the highest grand total once every player has filled all 13 scorecard boxes.

Turn

Roll all 5 dice, then choose to hold any and reroll the rest, up to two rerolls (three rolls total). Score your final roll into exactly one open box.

Scoring

• Upper section (Ones-Sixes): sum of matching dice, plus a 35-point bonus at 63+.
• Three/Four of a Kind and Chance: sum of all 5 dice.
• Full House (25), Small Straight (30), Large Straight (40), Yahtzee (50) score flat values when the dice match.
• Rolling a second Yahtzee scores a 100-point bonus, placed using a strict order: the matching upper box, then Three/Four of a Kind, then Chance or a stolen combo.

Optional Variants

Hosts may turn on In-Order (or Bottom-Up) category filling, a one-time Mulligan extra roll, or an alternate Joker Rule (Infinite Joker / No Jokers Allowed). All default off.

The full implementation contract lives in docs/YAHTZEE-RULES-CONTRACT.md.