I have this problem. First puzzle I ever tried, it's on Medium. Check out the screenshot (sorry it's not cropped or anything), pay attention to the center column, the 8s... there are other contradictions too but that one is obvious.
I have this problem. First puzzle I ever tried, it's on Medium. Check out the screenshot (sorry it's not cropped or anything), pay attention to the center column, the 8s... there are other contradictions too but that one is obvious.