This is not a computer game. This is a puzzle you prepare and print on paper.
Step 1 (optional). Change the design of the island.
Step 2. Click "hide the treasure".
Step 3. Print the map.
The puzzle is solved by finding locations on the island that correspond to the small map fragments.
? places to hide treasure
show ○ at places good to hide treasure (not water, unique 3x3 area)
show ○ / ○ if clicking there increases / decreases the number of places to hide treasure