Hungarian Pentomino

Author: Vladimir Portugalov

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Place the given pentominoes into the grid. Pentominoes may be rotated and reflected. Elements can not touch each other, not even diagonally. All painted cells belong to pentominoes and indicate every third cell used by pentominoes scanning the grid row by row from left to right.

Example puzzle

Grid control: Click the mouse button at the selected cell to change the color of the cell. You can also click on the given elements to mark them out. More details about grid control are at the help page.