Martin Kool's 0h h1 (hosted here with generous permission) is a simple little logic puzzle, also available free for iOS and Android, that's really just simply delightful. Click a square once to fill it in with red, twice to make it blue. The goal is to fill in the board in each round with the proper number and placement of red and blue squares, following the rules that govern correct placement. You can't have three of the same colours in a row either horizontally or vertically, a full row must have as many red squares as it does blue, and no two rows can be exactly the same. Tap the eye icon to get a hint, and the arrow to undo as many moves as you want, while the X will return you to the main menu. You can play levels 4x4, 6x6, 8x8, or 10x10, allowing you to get your fix at varying levels of difficulty.
With its crisp, clean interface and satisfyingly methodical gameplay, 0h h1 is a relaxing and cerebral little game that's perfect for fans of straightforward puzzling. Of course, when we call 0h h1 simple, we mean it. It's not going to introduce any new elements, you're not going to unlock any secret My Little Pony creepypasta levels. What you see is what you get, and, well, when what you're getting is a smart little puzzle game you can even take with you for free on your smartphone, that's a pretty sweet fruit indeed. Not every game needs to reinvent the wheel, and while it's based on a preexisting puzzle type, 0h h1 is proof that when it comes to making a quality puzzle, less is often more.
0h h1 (iPhone, iPod Touch, iPad)
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