diff --git a/__pycache__/asteroid.cpython-313.pyc b/__pycache__/asteroid.cpython-313.pyc
new file mode 100644
index 0000000..24e03b6
Binary files /dev/null and b/__pycache__/asteroid.cpython-313.pyc differ
diff --git a/__pycache__/asteroid_spawner.cpython-313.pyc b/__pycache__/asteroid_spawner.cpython-313.pyc
new file mode 100644
index 0000000..1aefda9
Binary files /dev/null and b/__pycache__/asteroid_spawner.cpython-313.pyc differ
diff --git a/__pycache__/spaceship.cpython-313.pyc b/__pycache__/spaceship.cpython-313.pyc
new file mode 100644
index 0000000..bde1bc0
Binary files /dev/null and b/__pycache__/spaceship.cpython-313.pyc differ
diff --git a/asteroid.py b/asteroid.py
index 257354b..a5ce8a5 100644
--- a/asteroid.py
+++ b/asteroid.py
@@ -2,3 +2,24 @@
 # ------------
 # By MWC Contributors
 # This module defines an asteroid agent class.
+
+
+class Asteroid:
+    character = 'O'
+
+    def __init__(self, position):
+        self.position = position
+
+    def play_turn(self, game):
+        width, height = game.board_size
+        if game.turn_number % 2 == 0: 
+            x, y = self.position
+            if y == height - 1: 
+                game.remove_agent(self)
+            else:
+                ship = game.get_agent_by_name('ship')
+                new_position = (x, y + 1)
+                if new_position == ship.position:
+                    game.end()
+                else:
+                    self.position = new_position
\ No newline at end of file
diff --git a/asteroid_spawner.py b/asteroid_spawner.py
index 92e542d..bcb0562 100644
--- a/asteroid_spawner.py
+++ b/asteroid_spawner.py
@@ -2,3 +2,19 @@
 # -------------------
 # By MWC Contributors
 # This module defines an AsteroidSpawner agent class.
+
+from random import randint
+from asteroid import Asteroid
+
+class AsteroidSpawner:
+    display = False
+
+    def play_turn(self, game):
+        width, height = game.board_size
+        game.state['score'] += 1
+        if self.should_spawn_asteroid(game.turn_number):
+            asteroid = Asteroid((randint(0, width - 1), 0))
+            game.add_agent(asteroid)
+
+    def should_spawn_asteroid(self, turn_number):
+        return randint(0, 1000) < turn_number
\ No newline at end of file
diff --git a/nav_game.py b/nav_game.py
index 191d83d..e7c8445 100644
--- a/nav_game.py
+++ b/nav_game.py
@@ -2,3 +2,14 @@
 # ------------
 # By MWC Contributors
 # This class implements a simple game where a spaceship avoids asteroids.
+
+
+from retro.game import Game
+from spaceship import Spaceship
+from asteroid_spawner import AsteroidSpawner
+
+board_size = (25, 25)
+ship = Spaceship(board_size)
+spawner = AsteroidSpawner()
+game = Game([ship, spawner], {"score": 0}, board_size=board_size)
+game.play()
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
index 3fece54..6ac31c3 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.0.0 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.1.4 and should not be changed by hand.
 
 [[package]]
 name = "ansicon"
@@ -15,21 +15,23 @@ files = [
 
 [[package]]
 name = "blessed"
-version = "1.20.0"
+version = "1.25.0"
 description = "Easy, practical library for making terminal apps, by providing an elegant, well-documented interface to Colors, Keyboard input, and screen Positioning capabilities."
 optional = false
-python-versions = ">=2.7"
+python-versions = ">=3.7"
 groups = ["main"]
 files = [
-    {file = "blessed-1.20.0-py2.py3-none-any.whl", hash = "sha256:0c542922586a265e699188e52d5f5ac5ec0dd517e5a1041d90d2bbf23f906058"},
-    {file = "blessed-1.20.0.tar.gz", hash = "sha256:2cdd67f8746e048f00df47a2880f4d6acbcdb399031b604e34ba8f71d5787680"},
+    {file = "blessed-1.25.0-py3-none-any.whl", hash = "sha256:e52b9f778b9e10c30b3f17f6b5f5d2208d1e9b53b270f1d94fc61a243fc4708f"},
+    {file = "blessed-1.25.0.tar.gz", hash = "sha256:606aebfea69f85915c7ca6a96eb028e0031d30feccc5688e13fd5cec8277b28d"},
 ]
 
 [package.dependencies]
 jinxed = {version = ">=1.1.0", markers = "platform_system == \"Windows\""}
-six = ">=1.9.0"
 wcwidth = ">=0.1.4"
 
+[package.extras]
+docs = ["Pillow", "Sphinx (>3)", "sphinx-paramlinks", "sphinx_rtd_theme", "sphinxcontrib-manpage"]
+
 [[package]]
 name = "jinxed"
 version = "1.3.0"
@@ -61,28 +63,16 @@ files = [
 [package.dependencies]
 blessed = ">=1.20.0,<2.0.0"
 
-[[package]]
-name = "six"
-version = "1.17.0"
-description = "Python 2 and 3 compatibility utilities"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
-groups = ["main"]
-files = [
-    {file = "six-1.17.0-py2.py3-none-any.whl", hash = "sha256:4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274"},
-    {file = "six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"},
-]
-
 [[package]]
 name = "wcwidth"
-version = "0.2.13"
+version = "0.2.14"
 description = "Measures the displayed width of unicode strings in a terminal"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 groups = ["main"]
 files = [
-    {file = "wcwidth-0.2.13-py2.py3-none-any.whl", hash = "sha256:3da69048e4540d84af32131829ff948f1e022c1c6bdb8d6102117aac784f6859"},
-    {file = "wcwidth-0.2.13.tar.gz", hash = "sha256:72ea0c06399eb286d978fdedb6923a9eb47e1c486ce63e9b4e64fc18303972b5"},
+    {file = "wcwidth-0.2.14-py2.py3-none-any.whl", hash = "sha256:a7bb560c8aee30f9957e5f9895805edd20602f2d7f720186dfd906e82b4982e1"},
+    {file = "wcwidth-0.2.14.tar.gz", hash = "sha256:4d478375d31bc5395a3c55c40ccdf3354688364cd61c4f6adacaa9215d0b3605"},
 ]
 
 [metadata]
diff --git a/spaceship.py b/spaceship.py
index 9f3552a..5a45e5f 100644
--- a/spaceship.py
+++ b/spaceship.py
@@ -2,3 +2,25 @@
 # ------------
 # By MWC Contributors
 # This module defines a spaceship agent class.
+
+
+class Spaceship:
+    name = "ship"
+    character = '^'
+
+    def __init__(self, board_size):
+        board_width, board_height = board_size
+        self.position = (board_width // 2, board_height - 1)
+
+    def handle_keystroke(self, keystroke, game):
+        x, y = self.position
+        if keystroke.name in ("KEY_LEFT", "KEY_RIGHT"):
+            if keystroke.name == "KEY_LEFT": 
+                new_position = (x - 1, y)
+            else: 
+                new_position = (x + 1, y)
+            if game.on_board(new_position):
+                if game.is_empty(new_position):
+                    self.position = new_position
+                else:
+                    game.end()
\ No newline at end of file