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!