It is O.K. A lot of puzzles. However, a numbers of puzzle are not good. For some puzzle you may have to guess. Some picture does not look like what it is claim to be. I would much prefer having the old style control (you first choose/select tool e.g. pen, mark, eraser, etc. Then you just tap to use it)
My favorite picross app! Downloaded this one a while back, still working through the puzzles.
Addicting So glad I discovered this.
Many hours of enjoyment New puzzles added regularly.
Simple and addictive As per title
This is the best nonogram puzzle app out there. It's the only one with challenging puzzles and an input system that works efficiently. I have solved all the puzzles they offer several times over, roughly 5000 solves in total. 4 years later I still love this app.