The number represents the number of cells it will fill. It can fill in one of the four directions (up, down, left, right). If a cell is already filled, it will fill the next available cell in the direction you chose. During the drag, the cells that are going to be filled will be highlighted. Features: - 320 hand-crafted puzzles - All levels are free and accessible from the start - Hints are available to help you find the solution to some levels - Game progress is saved automatically Don't hesitate to contact us if you find any issue with the game or if you simply want to send us your feedback, it is greatly appreciated.