I felt a little lost in the game and wasn't sure what I was supposed to be doing. I tried to do the puzzle and eventually found the key but it was too difficult to input into the screen so I gave up.
There’s a bit of glare on the screen, but otherwise everything seems functional. The puzzle works fine, but it looked like it would take a while to move all the numbers around. I was trying to click the individual boxes to change the numbers directly (until i found the arrows).