diff --git a/crafter/engine.py b/crafter/engine.py
index 7932f26..4859be2 100644
--- a/crafter/engine.py
+++ b/crafter/engine.py
@@ -206,7 +206,10 @@ def _tint(self, canvas, color, amount):
     return (1 - amount) * canvas + amount * color
 
   def _noise(self, canvas, amount, stddev):
-    noise = self._world.random.uniform(32, 127, canvas.shape[:2])[..., None]
+    state = self._world.random.get_state()
+    random = np.random.RandomState()
+    random.set_state(state)
+    noise = random.uniform(32, 127, canvas.shape[:2])[..., None]
     mask = amount * self._vignette(canvas.shape, stddev)[..., None]
     return (1 - mask) * canvas + mask * noise
 
diff --git a/crafter/env.py b/crafter/env.py
index e0d8e7b..8105575 100644
--- a/crafter/env.py
+++ b/crafter/env.py
@@ -160,6 +160,7 @@ def _balance_object(
     xmin, xmax, ymin, ymax = chunk
     random = self._world.random
     creatures = [obj for obj in objs if isinstance(obj, cls)]
+    creatures.sort(key=(lambda x: tuple(x.pos)))
     mask = self._world.mask(*chunk, material)
     target_min, target_max = target_fn(len(creatures), mask.sum())
     if len(creatures) < int(target_min) and random.uniform() < spawn_prob: