diff --git a/robotgame/logic/rollingstone.py b/robotgame/logic/rollingstone.py
index 487a048..8975678 100644
--- a/robotgame/logic/rollingstone.py
+++ b/robotgame/logic/rollingstone.py
@@ -50,7 +50,7 @@ class Turn(Field):
 class Goal(Field):
     def next_posdir(self, pos, direc):
         return pos, direc
-    
+
 class Stone(Field):
     def next_posdir(self, pos, direc):
         return pos, direc
@@ -61,7 +61,7 @@ def step(playfield, pos, direc):
     if field is not None:
         return field.next_posdir(pos, direc)
     return direc.next_pos(pos), direc
-        
+
 def reaches_goal(playfield, max_steps):
     pos = _find_start(playfield)
     direc = None
@@ -87,3 +87,7 @@ def _at(playfield, pos):
 _is = lambda t: lambda playfield, pos: isinstance(_at(playfield, pos), t)
 
 (isGoal, isTurn, isStart, isStone) = (_is(Goal), _is(Turn), _is(Start), _is(Stone))
+
+
+
+def generate_playfield():