Back in 2012, the UKPA held its first offline event in Manchester. I believe it was the only year that the organizers posted the puzzles online simultaneously for solvers around the world to compare their scores. The reception online was dismal so that idea was abandoned later on. I contributed some puzzles and sudokus for this event and I’ll be sharing my favourites over the next few weeks.
We’ll start with a tame Tetromino Minesweepers. I first saw this variant in Thomas Snyder’s old blog but I think there might have been earlier ones elsewhere. I’d love to know the history if anyone out there knows.
Tetromino Minesweepers: Place the 7 tetromino shapes into the grid; the shapes may be rotated but cannot be reflected. The numbers in the grid indicate how many of the adjacent cells (including diagonally adjacent cells) contain pieces of the tetrominoes. The tetrominoes cannot sit on the given numbers, and cannot touch even other, not even diagonally.