Role in multi-player games
Euchre, 500: As the highest trump or "top Bower".
Canasta: Uses two or three Jokers per deck. The Joker, like the deuce, is a wild card. However, the Joker is worth fifty points in melding, as opposed to twenty for the deuce.
Rummy: a wild card, able to be used as any necessary rank or suit to complete a meld.
Chase the Joker: An alternative version of Old Maid, where the Joker card is used instead of the Ace.
Poker: A Joker can be wild, or can be a "bug", a limited form of wild card which can be used only to complete straights and flushes.
War: In some variations, beats all other cards.
Pitch: A point card in some variations. Jokers usually are marked as "high" and "low", one outranking the other.
Daifugō: a wild card, or a deuce (which ends the round and clears the discard pile).
Crazy Eights: a "skip" card, playable on top of any other card, that forces the next player to lose a turn.
Spades: uncommon, but can fulfil one of two roles. When playing with three or six players, they are added to make the cards deal evenly (eighteen or nine cards each, respectively). They are either "junk" cards playable any time that cannot win a trick, or they count as the two highest trumps (the two Jokers must be differentiable; the "big Joker" outranks the "little Joker"). They also can be used in conjunction with teammates' cards to create a "pseudo-trump", e.g. an Ace of Hearts and a Joker played together could be counted as an Ace of Spades, inferior only to a natural Ace of Spades.
Double Pedro: As the lowest-ranked card, but worth 18 points.
Go Fish: In the pair-forming variant played between two players, the Joker pair is often used to bring the number of pairs to 27 and prevent a 13–13 tie.
Dou dizhu: Jokers are used as the highest value cards; one is little and one is big, usually the colored one being bigger. Both Jokers together is the only unbeatable play.
Bōzu mekuri: Uses Semimaru in an Uta-garuta deck as a joker. When drawn, the player may collect all discarded cards. However, if he is drawn on the last turn, then the player automatically loses instead.