Based on the fact that you get randomly thrown into a puzzle like #72, with many regions surrounded by black "+" squares, and no interior squares with a plus. What the heck are the rules for choosing the color in the regions surrounded by the black plus squares???...

I look carefully at this level and didn't see the "+" sign. Are they missing or it's just me not seeing it?

Instead of "Continue", would it be smarter to have "next level" and "random level" buttons instead?

I think a nice thing to add is an automatic saving when we exit a puzzle. Some puzzle take longer and if you don't have time to finish it, at least you don't lose your progress. Thanks.

Is it possible to reset the data/save? I tried to uninstall and remove the cloud option. But it didn't work. Thanks.