How do Joker cards work?

Jokers can remove any open card on the board, and can also be used to destroy the following blockers: Nets, Foam, Pirates, Bombs, and Locks.

You can earn Jokers by making streaks in levels. You can also get them by spending Coins, or by purchasing them as part of packs and special offers. Jokers can also be collected if they appear randomly on the board.

Note that there can only be one Joker on the board at any one time.