Everybody fills the same thirteen boxes. Highest sheet wins.
Two sentences of rules, and then three things that are the difference between a hundred and eighty and a two hundred and forty.
On your turn you roll five dice, keep any of them, roll the rest, keep any of them, and roll a third time. Then you write the result into one of the thirteen boxes on your sheet — and that box is now used up, whatever you put in it. Thirteen turns each, highest total wins.
Three of a kind and four of a kind score the sum of all five dice, not the sum of the matching ones. 6-6-6-5-5 in Three of a kind is twenty-eight. A great many versions of this game get that wrong, and it changes which dice are worth keeping — a triple of sixes with a pair of fives is a much better roll than a triple of sixes with two ones.
Thirty-five points sit behind an upper total of 63, which is exactly three of every number. So three is par: three fours is neither gain nor loss, four fours is four to the good, two fours is four behind. Chase the fourths and fifths of the big numbers early, and the thirty-five arrives on its own. It is the cheapest thirty-five on the sheet and most people never collect it.
You will have turns where nothing fits. The instinct is to dump the dice into whatever scores a few points; the better move is often to write a nought into the cheapest box you still own — usually Ones, sometimes Yahtzee — and keep the twenty-five and thirty back for the rolls that will fill them. Spending Full house on a garbage roll costs you far more than the nought does.
If you have already scored fifty in the Yahtzee box, every further Yahtzee is a hundred points on top of wherever you write it — and it may be written almost anywhere: its own number upstairs if that is still open, otherwise any open box at all, at full value. Five threes into Large straight is forty points plus the hundred. If you scored a nought in the Yahtzee box, there is no bonus and no joker. That is the real rule, and this table plays it.
Once you have rolled, every box you have not used yet shows the number it would score with the dice on the table. Nothing is hidden and nothing is decided for you — it is just the arithmetic, done. Tap a box to write it there. If the box would score nothing, it asks first, because that is the one move you cannot take back.