Every cell of the grid has to be part of exactly one pentomino. Orthogonally adjacent pentominoes have to be different from each other (i.e. they cannot be transformed into each other by reflection and/or rotation). In addition, a round trip has to be drawn into the grid. It runs horizontally and vertically between the centers of cells. It may not cross or touch itself. A clue in a cell indicates how many cells of the according pentomino are passed through by the round trip. Every pentomino contains at most one clue. A pentomino without a clue has to be visited by the round trip at least once.