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One unbroken line, through every square, ending exactly where the puzzle says. Every board below is a real one — you can solve them by eye.
The line begins on the red square and has to come to rest on the green ring. Only the lit squares are board — the gaps are not.
Drag up, down, left or right. Never diagonally, and never onto a square the line has already covered.
Every lit square, exactly once, finishing on the ring. That is this board solved.
The same board, gone round the other way. Every square is covered and the line still ends in the wrong place — on the dot, not the ring.
Drag back along the line to undo, or tap the red square to start over.