Rules: Shade some empty cells black to create a single connected wall. Numbers in a cell indicate the length of consecutive shaded blocks in the neighboring cells. If there is more than one number in a cell, then there must be at least one white (unshaded) cell between the black cell groups. Cells with numbers cannot be shaded, and the shaded cells cannot form a 2×2 square anywhere in the grid.
Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma. This example has the key “121,231,61,113”.
(Brief) History of Tapa: Tapa was created by Turkish puzzle designer Serkan Yürekli in 2007 for the Internet Puzzle Solvers Test (IPST) and was first regularly published by Akil Oyunlari. Tapa recieved broader recognition in 2009 before and during the World Puzzle Championship hosted in Antalya, Turkey.
History of this example: This “Quadrant” Tapa was written as an example for Grandmaster Puzzles by Thomas Snyder.
Sources for Tapa Puzzles: Follow this link for classic Tapa puzzles on this website and this link for variations on Tapa puzzles. 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 and in Tapa and Variations, both by Serkan Yürekli.
Design rules for contributors: A Grandmaster Tapa will have a unique solution that can be reached by logic alone. Generally, a Grandmaster Tapa will have symmetric clues and should have an interesting visual theme or an interesting solution. Sizes from 8×8 and above are recommended (maximum aspect ratio of 2:1 if rectangular).