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Inspired by this question:

Can you fit twelve pentominoes (not necessarily distinct) and one tetromino inside a 10 x 10 grid such that they do not overlap or touch each other orthogonally (horizontally or vertically)?

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  • $\begingroup$ Nice extension of my puzzle! $\endgroup$
    – Dmitry Kamenetsky
    Commented Jun 17, 2022 at 2:45

1 Answer 1

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Yes, and 12 is the maximum number: enter image description here

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    $\begingroup$ Excellent find! You can see that it can be made rotationally symmetric by changing the middle pentomino to a tetromino and extending the pattern in the rest of the grid to the bottom right (which was my original solution). $\endgroup$
    – hexomino
    Commented Jun 15, 2022 at 20:35

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