Place letters of the specified list into some cells, no more than one letter per cell, so that each letter appears exactly once in each row and column. The letters outside the grid indicate the first letter that can be seen in the respective row or column from the respective direction. Some letters may already be filled in for you.
(Rules and example (A-C) from PGP IB)
History of the puzzle
Invented by Tetsuya Nishio (Japan). First appeared in November 1990 issue of Puzzler magazine.
There are a lot. See List of Easy as variants.
Appearances in the past WPCs
Listed here are appearances of classic to almost-classic Easy as puzzles. For variants, see List of Easy as variants#Appearances in the past WPCs.
- WPC 2019/Round 7 by Ulrich Voigt
- WPC 2019/Round 8 by Rainer Biegler
- WPC 2019/Round 11 (Crosswise) by Jürgen Blume-Nienhaus
- WPC 2019/World Cup Round 3 by Silke Berendes
- WPC 2019/World Cup Playoffs by Ulrich Voigt
- WPC 2018/Round 2 by Jiří Hrdina
- WPC 2018/Round 4 (Hexagonal) by František Luskač
- WPC 2018/Round 5 (No Touch) by Jiří Hrdina
- WPC 2018/Round 11 (combination with Skyscrapers) by Jiří Hrdina
- WPC 2018/Team Round 2 (Hexagonal, part of a hybrid) by Jiří Hrdina
- WPC 2017/Round 1 by Deb Mohanty
- WPC 2016/Round 12
- WPC 2016/Round 13 (Irregular grid)