Tapa (Islands) by Murat Can Tonta
or solve online (using our beta test of Penpa-Edit tools; use tab to shift between shading mode and the composite Yajilin mode where left click marks cells, right click marks dots in cells or X’s on edges, left click+drag draws lines.)
Author/Opus: This is the 193rd puzzle from our contributing puzzlemaster Murat Can Tonta.
Rules: Standard Tapa rules. Also, similar to Nurikabe, each Tapa clue cell is part of an island of horizontally and vertically connected white cells and the area of the island must be one of the numbers in the clue (as an example, if a clue is 1 5, then the island containing that clue must be either 1 cell or 5 cells large). Islands are allowed to touch diagonally, and there may be islands without any number clues in the grid.
Difficulty: 2.5 stars
Time Standards (highlight to view): Grandmaster = 2:15, Master = 4:00, Expert = 8:00
Solution: PDF; a solution video is also available here.
Note: Follow this link for classic Tapa and this link for Tapa variations. If you are new to this puzzle type, here are our easiest Tapa puzzles to get started on. More Tapa puzzles can be found in The Art of Puzzles, in Tapa and Variations, and in our beginner-friendly collection Intro to GMPuzzles, all by Serkan Yürekli.
R5C8 can be both light and gray, isn’t it?
The unique solution is given in the PDF file. You can’t have R5C8 be light and also satisfy both the Tapa clues and the Island clues. If you believe you have an answer that does that, please double check or share it here.
In the pdf, if you unblack the R5C8, then don’t you get another valid solution?
The Tapa clue above in R4C8 would then have the shading around it be 221, not 24.