Roborant

by Fred Schneider

by Fred Schneider

This is a new Sudoku variation. In addition to solving the Sudoku, one must determine how to place islands and "water" based on specially marked clues indicating island size. The set of all numbers not in islands, the "water", should be orthogonally contiguous and there should be no 2x2 block of "water". So, the island/water layout must be a valid Nurikabe solution as well.

Clues that are in bold and have a border around them double as Nurikabe clues and indicate that they are part of a island/polyomino of that size. In these puzzles below, there are no invisible islands and each of these clues refer to a distinct island.

A special rule unique to this hybrid is that an island of size n must contain one block each of each number from 1 to n. So, an island marked with a 3 clue contains two other pieces, marked 1 and 2 in some order.

The goal of the puzzle is to both solve the Sudoku grid in such that a way that one can solve the Nurikabe constraints as well. Note: You may have to consider the placement of and values possible within the island(s) in order to resolve some Sudoku ambiguity.

Please PM if you think the explanation is unclear (especially after the walk-through). I hope you enjoy these. It was a fun challenge to create them.

Step 1 (Nurikabe)

Step 3 (Nurikabe

Step 4 (Nurikabe)

Step 5 (Nurikabe)

Step 6 (Sudoku

Step 7 (Sudoku

Step 8 (Nurikabe

Step 10 (Nurikabe Sudoku)

Don't forget that the two sides of the puzzle may rely on each other to determine a unique solution.

One other consideration: If it's not feasible to gray out the whole square with light pencil, try graying out a corner instead so you know it can't be part of an island.

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Puzzle 2: (8x8, Medium) (Answer)

Puzzle 3: (9x9, Medium to Hard) (Answer)

Challenge

One more thing: I have a challenge for any puzzle writers out there. Can anyone create a valid version of this puzzle with size 12x12 (broken up in 3x4 subgrids)? Just the filled-in solution (grid of numbers and outlines of islands) would suffice. Making a puzzle for someone else to solve would be an extra, simpler step.

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