The origin of this puzzle is not known.
Puzzle and Goal
An unsolved puzzle consists of a square grid containing some colored squares. Along the top and left side are number clues.
The goal is to place the twelve pentominos into the grid, according to the clues.
The solved grid must satisfy the following conditions:
Pentominos do not touch, even diagonally.
Pentominos cannot be placed on colored squares.
Clues on the left and top indicate the number of cells containing part of a pentomino in that rank.