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- Tracks
- <p>
- Complete the track from A to B so that the rows and
- columns contain the same number of track segments as are indicated in the
- clues to the top and right of the grid. There are only straight and
- 90-degree curved rail sections, and the track may not cross itself.
- <p>
- Left-click on an edge between two squares to add a track segment between
- the two squares. Right-click on an edge to add a cross on the edge,
- indicating no track is possible there.
- <p>
- Left-click in a square to add a colour indicator showing that you know the
- square must contain a track, even if you don't know which edges it crosses
- yet. Right-click in a square to add a cross indicating it contains no
- track segment.
- <p>
- Left- or right-drag between squares to lay a straight line of is-track or
- is-not-track indicators, useful for filling in rows or columns to match the
- clue.
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