How to open the cannons in the swamp
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On the sides of your map (left, top, right), you can find the same symbols that you have on the cannons.
On the map, between 2 symbols from the same kind you have 6 pieces of the map - you need to find where these pieces belong to on the map, when you find it, you'll see that a roman number is missing from the piece. This is the code you need. You collect all the 6 numbers for each symbol.
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