I just can’t get around this.
I have a 2D array with each cell consisting of ONE character (either a “.” or “#”) where the “.” is a “floor” and the “#” is a “wall”

what I need to do is convert all the “FLOOR” that is OUTSIDE the outer wall to a “+” to represent “dirt” for lack of a better description

worked perfectly… slapping forehead for not thinking of this one myself

Array is temp_level
replace exterior “:” characters with “+” characters

call flood_fill 1,0 // X is one-based, but Y is zero based

If x<1 Or y<0 Then Exit Sub
If y>temp_level.Ubound Then Exit Sub
If x>temp_level(y).Len Then Exit Sub
//
If Mid(temp_level(y),x,1)=":" Then
temp_level(y)=Left(temp_level(y),x-1)+"+"+Mid(temp_level(y),x+1)
//
flood_fill(x+1,y)
flood_fill(x-1,y)
flood_fill(x,y+1)
flood_fill(x,y-1)
End If