Every month Mazelog presents the challenge of a new logic maze. There's no prize this month, but solve the maze and get your name published in next month's list of correct entries.
Here's this month's maze:

### Square Square (hard)

To solve this month's maze you'll need to use a pencil and paper; you can't solve it interactively.

Start with 0 in the top left corner. Move horizontally or vertically to another number and add that to your total. Continue in this way, making a series of horizontal or vertical steps, each time adding the number you reach to your total. The restriction is that at each step the total must be a perfect square.

Your aim is to find the shortest route to the 15 in the bottom right corner.

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