ons is a variation on gin rummy.

the objective is to have the fewest cumulative points at the end of seven rounds.
points are accrued by cards left in a player's hand at the end of a round.
a round ends when a player is able to get rid of all their cards.
the game has seven rounds.

the game is organized around two groupings of cards: sets and runs.
a set is 3 or more cards of the same value.
a run is 4 or more consecutive cards of the same suit.

there is a concept in the game referred to as "going down".
initially, going down is the only method of reducing the # of cards in a player's hand.
each round asks the player to assemble a combination of sets and runs in their hand.
once that combination is completely assembled, all cards that participate in it can be laid down in front of the player.
once a player has gone down, they may extend any sets or runs laid down by any player.
once a player has gone down, this becomes the method of reducing the # of cards in their hand.

every turn starts with a draw, and ends with a discard.
going down or playing on another player's hand can only happen during a players turn.
your draw may be from the deck or from the discard pile.

the most recently discarded card, once and if passed over by the active player, becomes available to other players.
drawing a card in this manner increases the # of cards in a player's hand.
claim over the card is in precedence with turn order.
the player who discarded is ineligible to claim the card.
any card that has been discarded on top of is dead.

numbered cards count as themselves, face cards 10, black ace 15, red ace 25.

1. two sets
   
2. one set, one run
   
3. two runs
   
4. three sets
   
5. two sets, one run
   
6. one set, two runs
   
7. three runs
   

note that each round requires one additional card. this can be used to derive the sequence of rounds.

deal 11 cards for rounds 1-6, 13 for round 7.
dealer rotates in turn order.
red aces are wild.
aces are always high and runs do not wrap.
red aces that are "down" can be replaced by the card they represent.