Logic Masters Deutschland e.V.

Ever since PulverizingPancake made me a nurimisaki-sudoku hybrid for Secret Santa, I've been itching to set one myself. I recently got inspired after solving Nordy's "Snowballs", which is a brilliant ruleset and absolutely fantastic puzzle, so do check that out too!

Rules:

Normal Sudoku rules apply.

Nurimisaki: Shade some cells such that all unshaded cells form a single orthogonally connected area and no 2x2 region is entirely shaded or unshaded. Each circle in the grid is unshaded and acts as a dead-end—that is, exactly one of a circle’s orthogonally adjacent cells is unshaded. All circles (i.e. dead-ends) are given. A digit in a circle indicates the number of unshaded cells it sees. Shaded cells obstruct vision.

Snowballs: A blue circle is also a snowball, which rolls in a straight line—either horizontally or vertically—along the unshaded cells it sees. After the first two digits along this path, each digit is the sum of the previous two. (A snowball path must be of length 3 or more.)

Solve:

• SudokuPad
• F-Puzzles