This game originated in Japan and the rules are really simple. Enjoy hours of challenges. Fill in some of the empty cells with the following rules: 1. The number in a circle indicates the sum of the numberof continuous black cells extending from it, vertically and horizontally. 2. Dragon circles may have any number of black cells around them. 3. Cells with circles cannot be colored. This game includes 700 challenges across 7 levels of difficulty. In addition, every day you get 7 new challenges to complete within 24 hours. Every game you start is saved so you can take a break and come back to it without losing your progress. The game included 2 leaderboards, one for the daily challenges and one for the challenges. Each of our games includes a tutorial. This game does not display any ADS.