What do you want to know about the paper?
What's with the four coloured lines on the piece of paper?
The order of the four vertical coloured lines tells you which island you should dig on.
I still don't get it!?
Something else in the game makes the same coloured vertical lines
I don't see the connection between the lines and anything else.
If you're standing on the right island, your view of the rays of light from the mirrors will be the same as the lines on the map. They must appear in the same order from left to right.
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