The goal of the game is to move all cards off the center tableau.
Numbered cards can stack on the tableau, with smaller numbers stacked on larger numbers.
Cards can't be stacked on Dragons, or on cards of the same suit.
Multiple number cards can be moved around the tableau if they form a valid stack.
Dragon cards can't be stacked.
If the four dragons of a suit are uncovered and a slot is available, clicking the Dragon button moves that suit to a free slot in the upper-left foundation.