Candy Crush Saga is a game with a candy theme. The basic rule is to line up three to five identical candies in a row and eliminate the candies to score points The game requires different combinations of candies to be detonated together, which will produce different powerful effects. When a string of candies forms a combination, the player cannot move the other candies.

The game is played one by one, allowing you to invite Facebook friends to unlock longer trips after every fifteen levels. The first twenty levels can be unlocked directly, and the thirty-fifth level requires a ticket (sometimes a boat or airline ticket) in the Flash version. Each level has a different style and will drop random candy. Five hearts are provided at the beginning, one is deducted for each failed attempt and replenished after 30 minutes, and you can ask your Facebook friends to return the hearts or pay for them.

In the Flash version of the game, levels after Lemon Lake (episode 3) (including Lemon Lake) are chargeable and can be unlocked with the help of three Facebook friends who can also share the level with their friends. Of course, you can also use violence (playing missions) to get three keys to get a ticket (or boat or airline ticket), but for every key you get, you have to wait a day to grab another one.