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Sudoku enthusiasts will welcome this irresistible new creation: a maze-like brainteaser called yajilin. Each yajilin diagram--a grid of small squares with a scattering of numbers and arrows--conceals a captivating challenge for puzzle fans. The solver has to blacken in some of the empty squares (the numbers and arrows provide clues to their locations) and draw a twisting, turning line that passes through the rest of the squares, forming a closed loop. As in sudoku, the rules are few and simple, but finding the one correct solution can be diabolically difficult.