Let's see... if I shaded in that 4, I'd have to circle the 2 next to it, which would in turn mean I'd have to shade the other 2 next to that. That's a no-no because it and the 4 would isolate the circled 2, so the 4 must be circled. Circling that 4 means the 4 down there has to be shaded, so I'll circle the... phew, I'd better take a break. The latest Conceptis Light puzzle suite, Hitori Light, certainly is a mind-bender.
In it, you're presented with a square grid of seemingly random digits ranging from 1 to the grid's size, many repeating throughout. Your job is to shade or circle every square in the grid according to three important rules. Click on squares to cycle them between circled, shaded, and undecided. What are the three rules? I'm glad you asked...
- One: no two circled squares with matching digits may exist in the same row or column.
- Two: no two shaded squares may be directly adjacent to one another (touching corners doesn't count).
- And three: no circled square or group thereof may be completely isolated from the rest by shaded squares (again, touching corners doesn't count).
It takes a very particular kind of mind to come up with the genius puzzles given such a seemingly arbitrary set of rules, a kind of mind many just don't have (*achoo!*), but there must be at least half a dozen such minds working at Conceptis to come up with a whopping 30 puzzles across three grid sizes, to say nothing of their previous Light projects like Nurikabe Light and Sym-a-Pix Light. Each puzzle is fairly entertaining and has its own unique solution, and it's easy to start formulating strategies based on specific patterns of numbers that turn up often (for example, what does it mean when you see three of a number consecutively in a row or column?).
Looking for a mind-bending distraction for a few minutes of your time? Then come shade and circle some squares. I know I am.