+ Menubar option to choose whether solution is required or not.
So, you can turn off the solution to make solving even faster.
+ Made improvements in the 'logic'. (1 change)
Also, implemented the same logic but using less resource consuming methods.
Puzzle solving is now around 3x faster (for the toughest one) when the
solution is turned off.
+ Improved the puzzle solution -
1. The solution is not as clumsy as before.
2. The solution is highly detailed now.
The solution also shows how the puzzle looks at intermediate steps. (NEW)
(solution of toughest puzzle is of 6200 lines, ~110 Kb, uncompressed.)