Here’s a new (?) Sudoku variant. Inspired by Sudoku N from the upcoming Sudoku Mahabharat. The 6×6 example there also solves uniquely by these rules.
Rules Solve as a regular Sudoku. Some pairs of numbers are friends. Dots mark all spots where two friends are next to each other.
Another one for the GP. This is a Masyu with the extra rule that unused cells can’t touch by edge.
Solve and check your solution here, or use PZV (but that doesn’t verify the no-touch rule).
We continue with the regular puzzle-a-month-on-the-first-of. Here’s a Skyscraper-Nurikabe, a practice puzzle for the upcoming Indian GP.
Rules Solve as a regular Nurikabe. Additionally, some skyscraper clues are given outside the grid. For these, consider the blocks of adjacent shaded cells within the corresponding row as skyscrapers with height equal to the number of cells in the block.
Or check the instruction booklet which includes an example.
You can solve online (of sorts) and check your code here.
German qualifiers this weekend (English instruction booklet), with puzzles authored by Martin Merker and myself. Here’s a Kompass puzzle that didn’t make the cut because of an ambiguity that turned out to be not too hard to fix (I think!).
The WPC 2017 in Bengaluru is over. Here’s a puzzle from my very thin set of preparation puzzles. It’s from a round with original types that applied the same set of rules “twice over” in a sense.
Rules Solve the grid as a regular skyscrapers puzzle, digits 1 through 5. In addition, small clues in the outer corners are skyscraper clues for the regular skyscraper clues along the outside. These 20 regular syscrapers clues are part of the solution.
For example, the regular skyscraper clues along the left side could be something like 1,3,5,2,2 to satisfy the second-level 3 clue in the top left corner.
Or see the rules of Round 20: Puzzle Fusion in the WPC instruction booklet, available at the WPC page. You can find an example there, too.
You can check your solution and solve online here.
Here’s a Fillomino puzzle that’s left over from my Ramayan round round earlier this year. The construction failed a bit, but I hope you enjoy it nonetheless.
If you’re feeling adventurous, solve it (or verify that you did) with an experimental puzzle solving thingy I built: Puzzle 148: Fillomino.
Here’s a puzzle that I made as a Christmas present.
Rules Place the given set of dominoes in the marked domino tiles. Whenever two dominoes touch by an edge, the adjacent numbers must be the same. Clues outside the grid are skyscraper clues: They indicate the number of visible skyscrapers when looking along the corresponding row or column from that point, where each number represents a skyscraper of that height. Skyscrapers are blocked from view by those of greater or equal height.