Climbers is a cooperative trick-taking game.

Both decks are shufflet together, then each player is dealt 3 * n cards
for a game with up to 3 * n players (i.e. 3 cards up to 3 players, 6
cards up to 6 players, etc.).

The player to the right of the dealer plays one card face up on the
playing surface, then each player in counterclockwise order tries to
play a card from the same deck, higher than the ones already in play:
if they can't the hand is discarded, if all players manage to do so the
hand is moved to the score pile.

A variant allows intermediate players to play any card, and the hand is
won if the last player can beat all of the cards on the table, lost
otherwise.

Starting from the player who played the higher value card and proceeding
counterclockwise each player who had played a card picks up a new one
from the deck, and the next hand is started by the same player who
picked up first.

When there are no more cards in the deck the game continues until nobody
has any card in their hand.

The game is usually considered won when the score pile has at least
10362 points (half of the possible total of 20724), but more or less
skilled players may set different targets for themselves.