Pentominoes

Rules

Place the twelve pentominoes into the grid so that they do not touch each other, not even diagonally. Numbers below and to the right indicate the number of cells used by the pentominoes in the respective row and column. Pentominoes may be rotated and reflected. Cells marked with an × cannot be occupied with a pentomino.

(Rules and example (using 5 tetrominoes) from PGP IB)

Rule variations

• Place some of the given pentominoes rather than all 12 pentominoes.
• Place 5 / 7 tetrominoes (with or without reflection).
• Some cells belonging to a certain pentomino are marked with corresponding letters.

History of the puzzle

First seen on the WPC in 1996. Who invented it is unknown.

Variants

Galaxies and Pentominoes

See Spiral Galaxies#Galaxies and Pentominoes

Appearances in the past WPCs

• WPC 2019/Team Playoffs (Coded Tetrominoes) by Gabi Penn-Karras
• WPC 2019/World Cup Playoffs (Tetrominoes) by Roland Voigt
• WPC 2018/Round 6 (Galaxies and Tetrominoes, Galaxies and Pentominoes) by Jiří Hrdina
• WPC 2018/Team Round 1 (part of a hybrid puzzle) by Jiři Hrdina
• WPC 2017/Round 1 by Rajesh Kumar
• WPC 2017/Round 22 by Prasanna Seshadri
• WPC 2016/Round 6 (Combination puzzle) by Matúš Demiger
• WPC 2016/Round 17 by Matúš Demiger
• WPC 2012/Part 2