Up and Down – Sunny Seeds 2: Numbers puzzle Review

I only had the first version for a short time. But at first I don't see some of the things in the new version like undo or hints that would be nice to have. I did come to a puzzle, 31, that I can't seem to find a solution. It did crash a few times in the beginning. Overall it is great, if you like mind challenges like a Suddoko and such, you will probably like this too.
Review by Kpoliey on Sunny Seeds 2: Numbers puzzle.