Needs work.
The mouse was off from left to right.
There were differences that did not show up. On the second picture there was one star in a section near the top on the left and two on the right. After 5 clicks I guess you're not counting that as different enough. Fail.
You have no hint button at all? So I can burn through the entire time looking for where you changed the color by one hex digit from one side to the other?
Sorry. I do enjoy a challenge, but this is just frustrating. Other games will give hints with a cool down period. You should do the same. I hate staring at the picture for 10 minutes with no idea where YOUR difference may be when I've found some already that don't work.