final update for notebooks

notebooks/environments/Minigrid/minigrid/envs/GSW_Playground.py

@@ -98,6 +98,13 @@ class Playground(MiniGridEnv):
         self.put_obj(Goal(), width - 2, 1)
 
         # TODO: Add walls, pools of lava, etc. 
+        self.grid.horz_wall(2, 1, 3, slippery_north)
+        self.grid.vert_wall(5, 2, 2, slippery_east)
+        l = 4
+        self.grid.horz_wall(self.size - l - 1, self.size - 2, l, Lava)
+
+        self.put_obj(Lava(), 7, 3)
+
 
         if self.randomize_start:
             self.place_agent()