Go green{\color{#20A900} \mathbf{green}}!

Logic Level 3

You paint the 5×55 \times 5 grid green, one square at a time. You can only paint a square green if it shares an edge with 1 or 3 yellow squares (diagonals don't count).

What's the maximum number of squares you can color?

Below right is an example of a sequence of how you might paint the first 3 squares.

Clarification: The square colored green with sequence number 2 now borders two yellow squares, but it was bordering three yellow squares at the time of coloring.


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