In JJDD the Jokers aren't wild cards — they're the two highest trump cards in the deck. The Big Joker sits at the top. The Little Joker sits directly under it. Nothing else beats them. Learning to play with them well is the first real strategic skill in the game.
Big Joker vs. Little Joker: the ranking
The Big Joker (usually the colored one) is the highest card in the deck. The Little Joker (usually the black-and-white one) is second. Under them come the 2♦, the 2♠, then the Ace of Spades, then the rest of the spades in descending order.
Both count as spades — they can cut any suit, and they can only be played on a spade lead if you're following suit. In every practical sense they're the King and Queen of Spades on steroids.
When to lead a Joker
Lead the Big Joker when you need a guaranteed book on demand — you're on the last book of your bid, you need to force out a Power 2, or you're covering a partner's Nil and need to grab a book before it drops on them.
Lead the Little Joker when you want to draw out the Big Joker. If you don't have the Big and you suspect an opponent does, leading the Little forces them to either burn the Big or watch you take the book with the second-best card in the deck.
When to hold them
Hold a Joker when you have plenty of other winners in your hand and no immediate need to burn a nuke. Jokers late in the hand are insurance — if a bid starts to slip, you can drop one to save the contract.
Holding also matters for Nil defense. If your partner called Nil, keeping a Joker back means you can cover a suit where they can't. Burning it early on a book you didn't need is how partners get set.
The Joker mistake to avoid
Don't cut with a Joker when a low spade would do the job. Every Joker you burn on a low-value book is a book you can't take later. Save your nukes for books that actually matter — the ones that make or break the bid.
