Empty your rack first. On your turn, add at least one tile from your rack to the table — as new sets, or by rearranging what's already down. A run is 3+ consecutive numbers of one colour; a group is 3–4 of the same number in different colours. Every set on the table must be valid before you commit.
Your first play (the opening meld) must reach the set total using only your own tiles. Can't play? Draw a tile and pass. When the pool runs out and no one can move, the smallest rack wins.
Four moon jokers: standard (any tile), double (two values in a run), change-colour (the run must switch colour after it), mirror (hinge of a same-colour palindrome).