diff --git a/astar.py b/astar.py
index 802abe5..7780202 100644
--- a/astar.py
+++ b/astar.py
@@ -57,8 +57,12 @@ def _is_occupied(self,cell_coord):
             return False
 
     def _add_swamp(self, mouse_pos):
-        #insert swamp code here.
-        pass
+        swamp_coord = (mouse_pos[0]/50, mouse_pos[1]/50)
+        if self._is_occupied(swamp_coord):
+            if self.actors[swamp_coord].unremovable == False:
+                self.actors.pop(swamp_coord, None)
+        else:
+            self.actors[swamp_coord] = ObstacleTile( swamp_coord, self, './images/swamp.jpg', is_unpassable = False, terrain_cost = 3)
 
     def _add_lava(self, mouse_pos):
         lava_coord = (mouse_pos[0]/50, mouse_pos[1]/50)
@@ -91,14 +95,17 @@ def main_loop(self):
                 elif event.type is pygame.MOUSEBUTTONDOWN:
                     if self.add_tile_type == 'lava':
                         self._add_lava(event.pos)
-                    #insert swamp code here
+                    elif self.add_tile_type == 'swamp':
+                        self._add_swamp(event.pos)
+
                 elif event.type is pygame.KEYDOWN:
                     if event.key == pygame.K_SPACE:
                         self.paul.run_astar(self.cake.cell_coordinates, self)
                         self.paul.get_path()
                     elif event.key == pygame.K_l:
                         self.add_tile_type = 'lava'
-                    #insert swamp code here
+                    elif event.key == pygame.K_s:
+                        self.add_tile_type = 'swamp'
 
 class Actor(object):
     def __init__(self, cell_coordinates, world, image_loc, unremovable = False, is_obstacle = True):
@@ -123,7 +130,7 @@ def draw(self):
 
 class ObstacleTile(Actor):
     def __init__(self, cell_coordinates, world, image_loc, terrain_cost=0, is_unpassable = True):
-        super(ObstacleTile, self).__init__(cell_coordinates, world, image_loc, unremovable = False, is_obstacle = is_unpassable)
+        super(ObstacleTile, self).__init__(cell_coordinates, world, image_loc, unremovable = False, is_obstacle = True)
         self.terrain_cost = terrain_cost
         
 class Cell():
@@ -143,9 +150,9 @@ def f_cost(self):
 
     def draw(self):
         COST_TO_DRAW = ''
-        #COST_TO_DRAW = self.g_cost
-        #COST_TO_DRAW = self.h_cost
-        #COST_TO_DRAW = self.f_cost
+        COST_TO_DRAW = self.g_cost
+        # COST_TO_DRAW = self.h_cost
+        # COST_TO_DRAW = self.f_cost
         line_width = 2
         rect = pygame.Rect((self.coordinates[0],self.coordinates[1]),(self.dimensions[0],self.dimensions[1]))
         pygame.draw.rect(self.draw_screen, self.color, rect, line_width)
@@ -167,8 +174,8 @@ def get_h_cost(self, coord_a,coord_b):
     def get_open_adj_coords(self, coords):
         """returns list of valid coords that are adjacent to the argument, open, and not in the closed list."""
         #modify directions and costs as needed
-        directions = [(1,0),(0,1),(-1,0),(0,-1)]
-        costs = [1,1,1,1]
+        directions = [(1,0),(1,1),(0,1),(-1,1),(-1,0),(-1,-1),(0,-1),(1,-1),(2,0),(0,2),(-2,0),(0,-2)]
+        costs = [1,3,1,3,1,3,1,3,8,8,8,8]
         adj_coords = map(lambda d: self.world._add_coords(coords,d), directions)
         for i, coord in enumerate(adj_coords):
             costs[i] += self.world.get_terrain_cost(coord)
diff --git a/explaning_scores.md b/explaning_scores.md
new file mode 100644
index 0000000..307be92
--- /dev/null
+++ b/explaning_scores.md
@@ -0,0 +1,4 @@
+g-scores is how many costs it take for Paul to get to a square.
+h-score is how many cost it will take from that square to the cake. 
+f-score is the sum of g and h, and f-score is 18 if it's the shortest path. We can see from the f-score screenshot 
+that there are many shortest routes that Paul can choose from. 
diff --git a/f-score.png b/f-score.png
new file mode 100644
index 0000000..d86c66d
Binary files /dev/null and b/f-score.png differ
diff --git a/g-score.png b/g-score.png
new file mode 100644
index 0000000..21f0d9b
Binary files /dev/null and b/g-score.png differ
diff --git a/h-score.png b/h-score.png
new file mode 100644
index 0000000..c430030
Binary files /dev/null and b/h-score.png differ