Turn the entire board back to Grey.
Goal: Make every square on the board Grey.
The Catch: Clicking a square changes it, but also changes the 4 squares touching it (Up, Down, Left, Right).
The Cycle: Red ➔ Blue ➔ Green ➔ Grey ➔ Red.
Tip: Like a Rubik's Cube, look for overlapping points where one click fixes multiple squares at once!
Stuck? There is a mathematical algorithm that solves this 100% of the time.
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