[2] The game is highly social and based on online matches, requiring the player to find an opponent who can be appointed randomly by the system from online users, chosen from a list of friends set by the player, or selected from amongst their Facebook friends.

In each round, the player has two minutes to form as many words as possible with the sixteen letters available in the 4x4 grid on the screen.

The game success was initially confined to its domestic market in Sweden, and in nearby countries like Denmark, Norway and the Netherlands.

[1] In January 2013, six months after the original release, Ruzzle topped the list of most downloaded app in the United States[4] and as of April 2013 counts more than 35 million players in 128 different countries.

The levels span through five worlds: The Forest, The Swamp, The Volcano, Area 42, and The Lost Island.