Is there a solution booklet available?

Just going through these old tests for fun, but found the solution for "The Persistence of Memory" is not unique, which makes me think I may have something wrong? The two grey shapes on bottom right i'll call 'd' and 'NE arrow' can seem to have a number of routes through, and since there's no other shapes like them on board, doesn't seem to constrain this?

Here is my solution. I haven't verified that it's correct but I believe so. I think those two areas were the last to be placed, starting with the bottom left square of the 'd' as an x, as it is touched by the snake, and then the whole path is constrained.





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