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Minesweeper Example.png Minesweeper Example Solution.png

Place mines into the un-numbered cells in the grid, at most one mine per cell, so that each number in a cell represents the number of mines adjacent to that cell (including diagonally adjacent cells).

(Rules and example from PGP IB)

Rule variations[edit]

  • Sometimes the total number of mines are given.
  • Shape Minesweeper: Instead of single-cell mines, this variant requires solvers to place a given set of shapes in the grid. Probably the oldest of this type of variation is "Battleships varia #2" from WPC 1999/Part 9. The objective was to place a standard fleet of battleships so that numbers in a cell represent number of ship segments adjacent to it. Most puzzles requires shapes not to touch each other, but a puzzle from WPC 2017/Round 4 allowed it.

History of the puzzle[edit]

First Minesweeper game on PC appeared in 1983.[1] See the wikipedia article on the game for more details.


Shape Minesweeper[edit]

Tetromino Set Black.png Shape Minesweeper Example.png Shape Minesweeper Example Solution.png

Probably the oldest of this type of variant is "Battleships varia #2" from WPC 1999/Part 9. It can be seen as Shape Minesweeper with a standard fleet of battleships as the given set of shapes.

This very generalised name was first used in 2015 Puzzle Grand Prix, 5th Round. Author of the puzzle was Thomas Snyder (USA).

Place all of the given shapes into the grid. The shapes may be rotated and/or reflected. Shapes cannot cover the numbered cells. Shapes cannot touch each other (not even diagonally). Numbered cells indicate how many of the surrounding cells (including diagonally adjacent cells) will contain a shape part.

(Rules and example from PGP IB)

Rule variations[edit]

  • "Polyominoes" from WPC 2017/Round 4 can be seen as a Shape Minesweeper puzzle without diagonal constraints (shapes can touch pointwise, numbers didn't count diagonally touching cell).

Appearances in the past WPCs[edit]