Eva Star

A puzzle about building squares rather than lines. You click four tiles of the same color that form the corners of a square, and everything inside that square is wiped out — which means a big, carefully chosen square clears far more than a tight one. Eva Star puts a clock on it, so the tension is between taking the small clear now and hunting for the corners of a larger one. A small board, a single rule, and more depth than the size suggests.