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Source: AMS Grad Blog

In the grid below, there are 12 holes hidden in the grid. Each of the arrows is pointing towards at least one hole. None of the arrows covers a hole.

For example, the arrow in the first row tells you that at least one of the last four squares in that row contains a hole.

Find the location of all 12 holes.

If you enjoyed this puzzle, check out Sunday Afternoon Maths LXI,

puzzles about rugby, or a random puzzle.

puzzles about rugby, or a random puzzle.