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It is on the top center of the forested part.
It's near the north-eastern side of the forest
There isn't a riddle box on every single Isle, but most have one... so there may not be one on Brown,but there might be...
About halfway between the dock and the eastern end of the isle, by the northern beach
Rocky Mountain Horse -answer for Horse Isle 2 riddle box on Brown Isle
I think I saw it in the Big Forest.
there is no riddle box
There none.
In the northwest corner of the isle :)
It is by the southern south west edge of the light green grassy area in the center. -CalicoFilly
in a bolder
Close to the western corner