Shade some empty cells black; cells with numbers cannot be shaded. All black cells connect along edges to create a single connected region. (It is permissible for the region to touch itself at a corner, but touching at a corner does not connect the region.) No 2×2 group of squares can be entirely shaded black.
Numbers in a cell indicate the lengths of contiguous black cell groups along the "ring" of (up to) 8 cells touching that cell. (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.) The numbers are given in no particular order. As a special case, if the number given in a cell is a zero (0), it means that none of the cells around that cell may be shaded black.
(Rules and example from PGP IB)
- Some puzzles feature question marks (?) that stand for a non-zero number.
History of the puzzle
Appearances in the past WPCs
Listed here are appearances of classic to almost-classic Tapa puzzles. For variants, see list of Tapa variants#Appearances in the past WPCs.
- WPC 2019/Round 6 by Roland Voigt
- WPC 2019/Round 8 by Rainer Biegler
- WPC 2019/World Cup Playoffs by Rainer Biegler
- WPC 2018/Round 1 by Jiři Hrdina
- WPC 2018/Round 11 (combination with itself) by Jiří Hrdina
- WPC 2018/Round 13 by Jan Zvěřina
- WPC 2017/Round 6 (Tapa, Hexa Tapa, Toroidal Tapa, Knapp Daneben Tapa) by Prasanna Seshadri
- WPC 2016/Round 2 by Matej Uher
- WPC 2016/Round 6 (Combination) by Matej Uher
- WPC 2016/Round 9 by Matej Uher
- WPC 2016/Round 14 (part of a Permaculture hybrid) by Matúš Demiger
- WPC 2015/Round 1 (Cylindrical) by Andrey Bogdanov
- WPC 2015/Round 9 ("Different Areas") by Vladimir Portugalov