Normal sudoku rules apply. Each blue circle in the grid is a Snowball. Snowballs roll in straight lines—either horizontally or vertically—through a set of orthogonally connected cells. The total length (in cells) of a Snowball's path is given by the number in the top left corner of its starting cell. The digits along a Snowball's path behave as follows: after the first two digits, each digit is the sum of the two preceding digits (just like the Fibonacci Sequence). Snowballs may cross paths, and therefore may share one or more cells with other Snowballs.