Four Corners — find the rectangles

Four Corners is a puzzle of observation and speed. Find four blocks of the same color at the corners of a rectangle and select them one by one. Every block inside the rectangle disappears and new ones take their place. Larger rectangles earn more points, so look carefully before choosing.

Choose a fixed clock or a mode that adds time when you make a successful move. Play with a mouse or tap the screen. Keep scanning the changing board, look for larger shapes and try to improve your best score before the timer reaches zero.