diff --git a/environments/factory/base_factory.py b/environments/factory/base_factory.py
index 2f44844..85cb6e2 100644
--- a/environments/factory/base_factory.py
+++ b/environments/factory/base_factory.py
@@ -1,5 +1,6 @@
 from typing import List, Union
 
+import gym
 import numpy as np
 from pathlib import Path
 
@@ -29,7 +30,11 @@ class AgentState:
                 raise AttributeError(f'"{key}" cannot be updated, this attr is not a part of {self.__class__.__name__}')
 
 
-class BaseFactory:
+class BaseFactory(gym.Env):
+
+    @property
+    def action_space(self):
+        return self._registered_actions
 
     @property
     def movement_actions(self):
@@ -44,13 +49,20 @@ class BaseFactory:
         self.max_steps = max_steps
         self.allow_vertical_movement = True
         self.allow_horizontal_movement = True
+        self.allow_no_OP = True
+        self._registered_actions = self.movement_actions + int(self.allow_no_OP)
         self.level = h.one_hot_level(
             h.parse_level(Path(__file__).parent / h.LEVELS_DIR / f'{level}.txt')
         )
         self.slice_strings = {0: 'level', **{i: f'agent#{i}' for i in range(1, self.n_agents+1)}}
+
         self.reset()
 
-    def reset(self)  -> (np.ndarray, int, bool, dict):
+    def register_actions(self, n_actions):
+        self._registered_actions += n_actions
+        return True
+
+    def reset(self) -> (np.ndarray, int, bool, dict):
         self.done = False
         self.steps = 0
         self.cumulative_reward = 0
diff --git a/environments/factory/simple_factory_getting_dirty.py b/environments/factory/simple_factory_getting_dirty.py
index e2e190e..93421bd 100644
--- a/environments/factory/simple_factory_getting_dirty.py
+++ b/environments/factory/simple_factory_getting_dirty.py
@@ -11,7 +11,6 @@ from environments import helpers as h
 from environments.factory.renderer import Renderer
 from environments.factory.renderer import Entity
 
-
 DIRT_INDEX = -1
 
 
@@ -40,7 +39,7 @@ class GettingDirty(BaseFactory):
             height, width = self.state.shape[1:]
             self.renderer = Renderer(width, height, view_radius=0)
 
-        dirt   = [Entity('dirt', [x, y], (min(self.state[DIRT_INDEX, x, y],1)), 'scale') for x, y in np.argwhere(self.state[DIRT_INDEX] > h.IS_FREE_CELL)]
+        dirt   = [Entity('dirt', [x, y], self.state[DIRT_INDEX, x, y]) for x, y in np.argwhere(self.state[DIRT_INDEX] > h.IS_FREE_CELL)]
         walls  = [Entity('dirt', pos) for pos in np.argwhere(self.state[h.LEVEL_IDX] > h.IS_FREE_CELL)]
         agents = [Entity('agent', pos) for pos in np.argwhere(self.state[h.AGENT_START_IDX] > h.IS_FREE_CELL)]
 
@@ -101,7 +100,10 @@ class GettingDirty(BaseFactory):
 
     def calculate_reward(self, agent_states: List[AgentState]) -> (int, dict):
         # TODO: What reward to use?
-        this_step_reward = 0
+        current_dirt_amount = self.state[DIRT_INDEX].sum()
+        dirty_tiles = len(np.nonzero(self.state[DIRT_INDEX]))
+
+        this_step_reward = -(dirty_tiles / current_dirt_amount)
 
         for agent_state in agent_states:
             collisions = agent_state.collisions
@@ -113,8 +115,8 @@ class GettingDirty(BaseFactory):
             for entity in collisions:
                 if entity != self.string_slices["dirt"]:
                     self.monitor.add(f'agent_{agent_state.i}_vs_{self.slice_strings[entity]}', 1)
-        self.monitor.set('dirt_amount', self.state[DIRT_INDEX].sum())
-        self.monitor.set('dirty_tiles', len(np.nonzero(self.state[DIRT_INDEX])))
+        self.monitor.set('dirt_amount', current_dirt_amount)
+        self.monitor.set('dirty_tiles', dirty_tiles)
         return this_step_reward, {}
 
 
@@ -126,13 +128,13 @@ if __name__ == '__main__':
     monitor_list = list()
     for epoch in range(100):
         random_actions = [random.randint(0, 8) for _ in range(200)]
-        state, r, done, _ = factory.reset()
-        for action in random_actions:
-            state, r, done, info = factory.step(action)
+        env_state, reward, done_bool, _ = factory.reset()
+        for agent_i_action in random_actions:
+            env_state, reward, done_bool, info_obj = factory.step(agent_i_action)
             if render:
                 factory.render()
         monitor_list.append(factory.monitor.to_pd_dataframe())
-        print(f'Factory run {epoch} done, reward is:\n    {r}')
+        print(f'Factory run {epoch} done, reward is:\n    {reward}')
 
     from pathlib import Path
     import pickle