How can you not love the number 10? Fingers! Toes! Tiny Turtles Talking On The Telephone! And most importantly, 10 is the title of a new sliding-block puzzle game by iojoe. Mathematical! In each puzzle, you will be presented with a grid with several squares of numbers (positive or negative) on it. By clicking and dragging those squares, they will travel until they hit a wall or collide with another square. When two squares collide, their numbers are totaled into one new square. If the total is equal to 10, the square becomes an immovable block, but no square can have a total higher than 10. The goal is to combine all the squares on the board into 10s, without getting blocked in. And, with later additions like wormholes, the ten-ing will only get trickier with time!
10 is a colorful and entertaining work whose gentle learning curve works up to some quite interesting puzzles, with the "undo" function keeping it from becoming too frustrating. Though the mental math required is not difficult, playing 10 definitely feels like the kind of brain-training that Nintendo's Floating-Japanese-Doctor-Head-Guy would approve of (not to mention giving a whole new appreciation for the arithmetic weirdness of "0" and negative numbers.) The free browser version offers 55 of the mobile version's 140 total levels, though expansions are currently planned. Anyone in search of a good little mind-twister, should definitely give it their full a-10-tion.