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Secure Your Phone with Pretty Pictures

A good friend of mine is moving on up in the world, and to prove it, he recently upgraded his cell phone. His new phone is one of several that has a clever password feature – instead of entering a traditional password, one creates a shape within a 9 point grid, like a miniature connect the dots. Here’s one video explaining the feature:

The rules for the patterns are fairly simple, but to make things crystal clear, let me label the dots in the grid as follows:

Here are the rules constraining the types of patterns you can make:

The pattern must connect at least 4 dots. No dot may be used more than once. The order in which the dots are connected matters. Two dots which are on opposite sides of the grid (e.g. 1 and 9, 2 and 8, 1 and 3) cannot be connected . . . → Read More: Secure Your Phone with Pretty Pictures