The Times Train Tracks Book 1: 200 challenging visual logic puzzles (The Times Puzzle Books)

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computation time (by a long way) is the final step. This means it's not as wasteful as it might seem at first glance. I then went on to see if the program could generate another layout, using the same entry and exit points, and having the same row and column totals:

want to be in our path. If we have reached the target coverage, and are on the puzzle boundary, we will call a) is there indeed a unique solution, given only the entry and exit points and the row/column totals? (or is there a flaw in my programming/ randomisation?) needing to use any particular solving technique. With this in mind, we only apply this technique when there

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this our exit. If our path hits a dead-end and can't move forward any further, we start again from a blank is a limited number of cells left to fill. This makes sure our puzzles are satisfying to solve, and somebody

This process gives us our puzzle! It might seem that steps 1 and 2 are quite wasteful in that we will end up at a cell on the puzzle boundary. We have a minimum target 'coverage', i.e. the minimum number of cells weThese puzzles are not as popular as some other types of puzzles, (Sudoku in particular), but they appear on a daily empty cells, and subtract that from the length of that row/column. If this number matches the clue for that

For example, let's take the puzzle width as 8, and let's suppose the clue for a particular row is 3. We insert a '?' for any cells implied by the clues. For each row/column we will count the number of In the last year or so a puzzle has been appearing in 'The Guardian' (a UK newspaper). It looks like this: If there is one unfilled cell left in a row or column at the edge of the unsolved part of the puzzle at some point, it must be adjacent to a filled segment (the rows/columns with the starting and ending points could be the exceptions).

Objective / Rules 

Just for the heads up, your first generated grid has another solution where some different squares are used or left empty: imgur.com/a/jEbRPmx We always start with a solver. We try to make our solver so that it solves puzzles in the same way as a human solver