Picross Test

This is a short picross game I built in 4 days, it is more a test to see how they work, I have some features that I want to implement into this if I were to expand this further but I want to build some other puzzles first, just to have the code for a few puzzle ready for if I need them for a bigger project. There are a total of seven puzzles, three of the 5x5 two of the 10x10 and one each of the 15x15 and 20x20 sizes.You can left-click and drag the mouse to fill in tiles, or single click each ti...