KNS Puzzles offers the Tracks puzzles in the following formats:
4 x 4 - Puzzle A - B
5 x 5 - Puzzle A - B
6 x 6 - Puzzle A - B
7 x 7 - Puzzle A - B
8 x 8 - Puzzle A - B
9 x 9 - Puzzle A - B
10 x 10 - Puzzle A - B
12 x 12 - Level 1
Find the route of the track. There is only one start and one end to the track. The track doesn't cross itself. The numbers across the top and down the side tell you how many track pieces are in the respective row or column. What are the numbers for? These tell you how many track pieces there are in the Rows and Columns.
This is the start of the puzzle.
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).
As this is a corner square, there is only one possible direction for the track to take.
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.
These clues can only be satisfied in one way, so we can place track pieces and X's as required.
The track can only go one way through these squares.
The track can only go one way through these squares.
The track can only go one way through this square, and the puzzle completes.
The completed puzzle.