The deck and the players
13-card rummy is played with two standard 52-card decks plus two printed jokers, shuffled together. Two to six players sit at the table. Each player receives 13 cards, one at a time, dealt clockwise. The next card is turned face-up beside the deck; the remainder stays face-down as the closed pile. That face-up card also names the wild joker for this hand.
A turn, in order
On your turn you must perform two actions: draw one card, then discard one card. The draw can come from the closed pile or the discard pile. The discard goes face-up to the discard pile. You cannot end your turn without discarding, and you cannot skip a turn. A timer of thirty seconds is standard on most platforms.
Ending the hand
The hand ends the moment a player declares. To declare, you must lay all thirteen cards on the table grouped into valid melds with any remaining cards shown as deadwood. The remaining players score their deadwood against you. The lowest-scoring hand at the table wins.
Dropping instead of finishing
If your hand looks unplayable, you can drop before you draw any card (first drop, 20 points) or after you have drawn at least one card (middle drop, 40 points). You cannot drop on your final turn. A full count is scored when you finish a hand without declaring, capped at 80 points.