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Step 1 This is the start of the puzzle.
Solve this puzzle for yourself at the same time.
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Step 2 As this is 4 x 4 puzzle we know that every square in these columns is a track piece (but we're not yet sure in which direction). Clicking the squares will place an unknown track piece.
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Step 3 As this is a corner square, there is only one possible direction for the track to take, so we can click between the track squares to force the direction.
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Step 4 Forcing the corner direction means that the track must leave the corner to the right, which means that this 1 clue is now satisfied and all of the other squares in this column cannot be track pieces, so we can place an X in each.
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Step 5 These clues can only be satisfied in one way, so we can place track pieces and X's as required.
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Step 6 The track can only go one way through these squares.
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Step 7 The track can only go one way through these squares.
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Step 8 The track can only go one way through this square, and the puzzle completes.
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Step 9 The completed puzzle.
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