Not bad!
Not a bad game, the idea is pretty original and addictive, but it's short. Make a longer version and it will be awesome!
Author Comments
Solve each of the 10 levels by filling in the gray squares to make the difference of the black squares, both rows and columns. Careful though: boxes can have a pair that must contain the same number. Give the game your best shot!
Interesting
I didn't actually work out what I was supposed to be doing until either the 2nd or 3rd level, after I did though it was really interesting. Unfortunately in the end I resulted to using a calculator, however it was a great game, an original idea well presented!