diff --git a/baselines/common/cmd_util.py b/baselines/common/cmd_util.py
index d69589c..44dafa1 100644
--- a/baselines/common/cmd_util.py
+++ b/baselines/common/cmd_util.py
@@ -16,30 +16,56 @@ from baselines.common import set_global_seeds
 from baselines.common.atari_wrappers import make_atari, wrap_deepmind
 from baselines.common.vec_env.subproc_vec_env import SubprocVecEnv
 from baselines.common.vec_env.dummy_vec_env import DummyVecEnv
-from baselines.common.retro_wrappers import RewardScaler
+from baselines.common import retro_wrappers
 
-
-def make_vec_env(env_id, env_type, num_env, seed, wrapper_kwargs=None, start_index=0, reward_scale=1.0):
+def make_vec_env(env_id, env_type, num_env, seed, wrapper_kwargs=None, start_index=0, reward_scale=1.0, gamestate=None):
     """
     Create a wrapped, monitored SubprocVecEnv for Atari and MuJoCo.
     """
     if wrapper_kwargs is None: wrapper_kwargs = {}
     mpi_rank = MPI.COMM_WORLD.Get_rank() if MPI else 0
-    def make_env(rank): # pylint: disable=C0111
-        def _thunk():
-            env = make_atari(env_id) if env_type == 'atari' else gym.make(env_id)
-            env.seed(seed + 10000*mpi_rank + rank if seed is not None else None)
-            env = Monitor(env,
-                          logger.get_dir() and os.path.join(logger.get_dir(), str(mpi_rank) + '.' + str(rank)),
-                          allow_early_resets=True)
+    seed = seed + 10000 * mpi_rank if seed is not None else None
+    def make_thunk(rank):
+        return lambda: make_env(
+            env_id=env_id,
+            env_type=env_type,
+            subrank = rank,
+            seed=seed,
+            reward_scale=reward_scale,
+            gamestate=gamestate
+        )
 
-            if env_type == 'atari': return wrap_deepmind(env, **wrapper_kwargs)
-            elif reward_scale != 1: return RewardScaler(env, reward_scale)
-            else: return env
-        return _thunk
     set_global_seeds(seed)
-    if num_env > 1: return SubprocVecEnv([make_env(i + start_index) for i in range(num_env)])
-    else: return DummyVecEnv([make_env(start_index)])
+    if num_env > 1:
+        return SubprocVecEnv([make_thunk(i + start_index) for i in range(num_env)])
+    else:
+        return DummyVecEnv([make_thunk(start_index)])
+
+
+def make_env(env_id, env_type, subrank=0, seed=None, reward_scale=1.0, gamestate=None, wrapper_kwargs=None):
+    mpi_rank = MPI.COMM_WORLD.Get_rank() if MPI else 0
+    if env_type == 'atari':
+        env = make_atari(env_id)
+    elif env_type == 'retro':
+        import retro
+        gamestate = gamestate or retro.State.DEFAULT
+        env = retro_wrappers.make_retro(game=env_id, max_episode_steps=10000, use_restricted_actions=retro.Actions.DISCRETE, state=gamestate)
+    else:
+        env = gym.make(env_id)
+
+    env.seed(seed + subrank if seed is not None else None)
+    env = Monitor(env,
+                  logger.get_dir() and os.path.join(logger.get_dir(), str(mpi_rank) + '.' + str(subrank)),
+                  allow_early_resets=True)
+
+    if env_type == 'atari':
+         return wrap_deepmind(env, **wrapper_kwargs)
+    elif reward_scale != 1:
+         return retro_wrappers.RewardScaler(env, reward_scale)
+    else:
+        return env
+
+
 
 def make_mujoco_env(env_id, seed, reward_scale=1.0):
     """
diff --git a/baselines/run.py b/baselines/run.py
index 8ab71ac..dedca8b 100644
--- a/baselines/run.py
+++ b/baselines/run.py
@@ -7,13 +7,12 @@ import tensorflow as tf
 import numpy as np
 
 from baselines.common.vec_env.vec_frame_stack import VecFrameStack
-from baselines.common.cmd_util import common_arg_parser, parse_unknown_args, make_vec_env
+from baselines.common.cmd_util import common_arg_parser, parse_unknown_args, make_vec_env, make_env
 from baselines.common.tf_util import get_session
-from baselines import bench, logger
+from baselines import logger
 from importlib import import_module
 
 from baselines.common.vec_env.vec_normalize import VecNormalize
-from baselines.common import atari_wrappers, retro_wrappers
 
 try:
     from mpi4py import MPI
@@ -87,38 +86,21 @@ def build_env(args):
     if sys.platform == 'darwin': ncpu //= 2
     nenv = args.num_env or ncpu
     alg = args.alg
-    rank = MPI.COMM_WORLD.Get_rank() if MPI else 0
     seed = args.seed
 
     env_type, env_id = get_env_type(args.env)
 
-    if env_type == 'atari':
+    if env_type in {'atari', 'retro'}:
         if alg == 'acer':
             env = make_vec_env(env_id, env_type, nenv, seed)
         elif alg == 'deepq':
-            env = atari_wrappers.make_atari(env_id)
-            env.seed(seed)
-            env = bench.Monitor(env, logger.get_dir())
-            env = atari_wrappers.wrap_deepmind(env, frame_stack=True)
+            env = make_env(env_id, env_type, seed=seed, wrapper_kwargs={'frame_stack': True})
         elif alg == 'trpo_mpi':
-            env = atari_wrappers.make_atari(env_id)
-            env.seed(seed)
-            env = bench.Monitor(env, logger.get_dir() and osp.join(logger.get_dir(), str(rank)))
-            env = atari_wrappers.wrap_deepmind(env)
-            # TODO check if the second seeding is necessary, and eventually remove
-            env.seed(seed)
+            env = make_env(env_id, env_type, seed=seed)
         else:
             frame_stack_size = 4
-            env = VecFrameStack(make_vec_env(env_id, env_type, nenv, seed), frame_stack_size)
-
-    elif env_type == 'retro':
-        import retro
-        gamestate = args.gamestate or retro.State.DEFAULT
-        env = retro_wrappers.make_retro(game=args.env, state=gamestate, max_episode_steps=10000,
-                                        use_restricted_actions=retro.Actions.DISCRETE)
-        env.seed(args.seed)
-        env = bench.Monitor(env, logger.get_dir())
-        env = retro_wrappers.wrap_deepmind_retro(env)
+            env = make_vec_env(env_id, env_type, nenv, seed, gamestate=args.gamestate, reward_scale=args.reward_scale)
+            env = VecFrameStack(env, frame_stack_size)
 
     else:
        config = tf.ConfigProto(allow_soft_placement=True,