Daily puzzle (2021-06-05)

Scores

Double Back

Author: Andrey Bogdanov

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Draw a closed loop through all cells by connecting the centers horizontally and vertically. The loop can't cross or touch itself. he loop must enter and exit each boldly marked area exactly twice.

Example puzzle

Grid control: To draw a line press the mouse button at a start cell and move mouse to another cell holding the button. More details about grid control are at the help page.