Line Master Puzzle comes from KAU, Inc. The purpose is to fill the grid from start to finish. We've seen this kind of game many times.
I did the 90 Normal levels very quickly. Maybe 15 minutes.
The 90 hard levels had some interesting elements:
The arrows force the movement to the end.
A vertical or horizontal way: the path must pass over that square and not make a turn.
I solved all 90 hard levels and then the 90 Pro levels. Pro levels had no additional features. Drat. But they were still fun.
Absolutely a good game.