194567

You must start in the middle (6,6) as the middle is equally as close to all four of the corners. Then if the treasure is more than (I used this rule, you don't have to use these exact same numbers) 4 steps away, then you go for (any) one of the corners and you input the coordinates right in between the center and the corner you chose. If it's further away than when you did (6,6) go for the midpoint of the center and the opposite corner. Keep doing this until you get close (less than 6 steps away) then you find every possible coordinate it could be but don't enter it yet, click on them and then count if they are the number away from the points previously plotted as it say on the points. When you find one which is correct and you've checked it with all of the points previously plotted, enter it.