Candy crush is the exact copy of an older game 'Bejeweled'. The concept is not new but the way Candy Crush designers introduced new elements such as sweets and candies resulted in an instant emotional connection with the game. People unconsciously feel better by just looking at a Candy Crush game.
Compare the sounds of the rewards in Candy Crush, when the guy says 'delicious', for example, to all sounds in other similar games. Because the reward given to the brain in such a case is very pleasant, people feel like they want to play more.
According to some studies, the brain finds things more valuable when they are scarce. Because Candy Crush lives run out fast and come back slow, people become more attached to the game and don't get enough of it easily.
The sounds of candies falling, hitting each other and disappearing were perfectly selected. These sounds provide unconscious rewards to the brain and make people more hooked to Candy Crush than other similar games.
Studies have shown that variable rewards result in addiction. When you do a move in candy crush you might unexpectedly clear so many candies through chains of moves that weren't anticipated. Variable rewards make anything addictive. Slot machines work the same way.
Frustration is a very important component in games. When you see the Jelly you can't remove easily, you get frustrated. The more frustrated you get while playing a game, the more likely you are to keep playing in order to beat the game and end this frustration.
The music played in the Candy Crush game helps people relax and feel better. Unlike the fast paced music that might trigger different emotional states, Candy Crush music helps people feel calm and at ease.
Candy Crush allows people to post the levels they reach on Facebook. This creates fierce social competition between friends. If someone else has reached level 100, why am I stuck at level 89? This kind of competition makes the game more addictive. See what makes a game addictive
Candy Crush greatly depends on luck. No matter how clever you are, you need to be lucky enough to be able to win a game. The game seems 100% controllable, while in fact it's not, which makes people think they can beat any level by increasing their skills and so they get addicted.
Candy crush is played by both men and women, kids and adults alike. It's not designed for a certain group of people and that's one of the reasons why it got so popular.