diff --git a/jumanji/environments/logic/sliding_tile_puzzle/constants.py b/jumanji/environments/logic/sliding_tile_puzzle/constants.py
new file mode 100644
index 000000000..bcd00a544
--- /dev/null
+++ b/jumanji/environments/logic/sliding_tile_puzzle/constants.py
@@ -0,0 +1,15 @@
+# Copyright 2022 InstaDeep Ltd. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+EMPTY_TILE = 0
diff --git a/jumanji/environments/logic/sliding_tile_puzzle/env.py b/jumanji/environments/logic/sliding_tile_puzzle/env.py
index 23d42b307..001b582c5 100644
--- a/jumanji/environments/logic/sliding_tile_puzzle/env.py
+++ b/jumanji/environments/logic/sliding_tile_puzzle/env.py
@@ -84,7 +84,8 @@ def __init__(
             reward_fn: RewardFn whose `__call__` method computes the reward of an environment
                 transition. The function must compute the reward based on the current state,
                 the chosen action and the next state.
-                Implemented options are [`DenseRewardFn`, `SparseRewardFn`]. Defaults to `DenseRewardFn`.
+                Implemented options are [`DenseRewardFn`, `SparseRewardFn`].
+                Defaults to `DenseRewardFn`.
             viewer: environment viewer for rendering.
         """
         self.generator = generator or RandomGenerator(grid_size=5)
diff --git a/jumanji/environments/logic/sliding_tile_puzzle/generator.py b/jumanji/environments/logic/sliding_tile_puzzle/generator.py
index 99c032dde..6923730ae 100644
--- a/jumanji/environments/logic/sliding_tile_puzzle/generator.py
+++ b/jumanji/environments/logic/sliding_tile_puzzle/generator.py
@@ -19,6 +19,8 @@
 import jax
 from jax import numpy as jnp
 
+from jumanji.environments.logic.sliding_tile_puzzle.constants import EMPTY_TILE
+
 
 class Generator(abc.ABC):
     @property
@@ -76,7 +78,7 @@ def __call__(self, key: chex.PRNGKey) -> Tuple[chex.Array, chex.Array]:
 
         # Find the position of the empty tile
         empty_tile_position = jnp.stack(
-            jnp.unravel_index(jnp.argmax(puzzle == 0), puzzle.shape)
+            jnp.unravel_index(jnp.argmax(puzzle == EMPTY_TILE), puzzle.shape)
         )
 
         return puzzle, empty_tile_position
@@ -127,7 +129,7 @@ def __call__(self, key: chex.PRNGKey) -> Tuple[chex.Array, chex.Array]:
 
         # Find the position of the empty tile
         empty_tile_position = jnp.stack(
-            jnp.unravel_index(jnp.argmax(puzzle == 0), puzzle.shape)
+            jnp.unravel_index(jnp.argmax(puzzle == EMPTY_TILE), puzzle.shape)
         )
 
         return puzzle, empty_tile_position