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# 0h n0

• Currently 4.3/5
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Martin Kool's 0h h1 was the very best kind of puzzle game... simple yet smart. 0h n0 has now arrived, also free for iOS and Android, and it's every bit as elegant and addictive as its cousin. The object of the game is to mark which circles on the board are blue, and which are red, using logic to figure out their positions. See, blue circles will tell you how many other circles they can "see" in their own row and column by displaying a number atop themselves, while red circles block their view. Click an empty circle once to make it blue, and again to mark it red, clicking the little arrow in the menu at the bottom of the screen if you need to undo something. The game can generate several different sizes of the puzzle for you, making sure you always have just the right amount to sate your appetite, and its clean, minimalist design and easy to pick up, Minesweeper-esque concept means it can be played by just about anyone... and, well, it probably should be!

Play 0h n0

0h n0 (iPhone, iPod Touch, iPad)

0h n0 (Android, Android Tablet)

February 13, 2015 8:54 PM

There is one rule the game doesn't state until you've contradicted it, which I just discovered myself:

Every blue circle must be able to "see" at least one other blue circle-- in other words, you can't have a single blue completely surrounded by reds.

I don't understand the meaning of numbers inside circles.

The number in a blue circle is the total number of blue circles above, below, to the left, and to the right of that circle, with no intervening red circles. For example:

``` . . . b . . . . r . . . . B . r B B 4 r . . . B . ```

Here the capital B's are the circles that count toward the total of 4.

(I'm still finding these puzzles a bit too slow-going to be much fun, but I'll stick with them a little longer to see if I pick up a knack for them.)

Argh, I'm used to Range from Simon Tatham's puzzle collection: The rules are mostly the same, but the number INCLUDES the cell doing the counting, and is one higher.

I really really like it, I played every single games of conceptis and welovepuzzle and even in printed magazines I wasn't finding any new games, here is something new to me and I find very enjoyable to find myself consequences of the rules that allow to solve the puzzle without trying things randomly.

February 17, 2015 2:04 PM

Fun. I'm having slow-brain today and so it's a bit of a struggle, in a good way.

Is there one and only one solution to each? It seems like there could be a couple ways out.

So far I had only only solution each time.

Thanks ishanpm for talking about tatham's puzzles, I didn't know it and I like them. If you know other puzzles feel free to tell.

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