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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.