diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..38734ca
Binary files /dev/null and b/.DS_Store differ
diff --git a/__pycache__/asteroid.cpython-311.pyc b/__pycache__/asteroid.cpython-311.pyc
new file mode 100644
index 0000000..d24fbe6
Binary files /dev/null and b/__pycache__/asteroid.cpython-311.pyc differ
diff --git a/__pycache__/asteroid_spawner.cpython-311.pyc b/__pycache__/asteroid_spawner.cpython-311.pyc
new file mode 100644
index 0000000..41922fa
Binary files /dev/null and b/__pycache__/asteroid_spawner.cpython-311.pyc differ
diff --git a/__pycache__/spaceship.cpython-311.pyc b/__pycache__/spaceship.cpython-311.pyc
new file mode 100644
index 0000000..f7f748c
Binary files /dev/null and b/__pycache__/spaceship.cpython-311.pyc differ
diff --git a/asteroid.py b/asteroid.py
index 257354b..6249197 100644
--- a/asteroid.py
+++ b/asteroid.py
@@ -2,3 +2,22 @@
 # ------------
 # By MWC Contributors
 # This module defines an asteroid agent class.
+class Asteroid:
+    character = '0'
+
+    def __init__(self, position):
+        self.position = position
+
+    def play_turn(self, game):
+        if game.turn_number % 2 == 0:
+            x, y = self.position
+            board_height = game.board_size[1]
+            if y == board_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
diff --git a/asteroid_spawner.py b/asteroid_spawner.py
index 92e542d..033fd41 100644
--- a/asteroid_spawner.py
+++ b/asteroid_spawner.py
@@ -2,3 +2,22 @@
 # -------------------
 # By MWC Contributors
 # This module defines an AsteroidSpawner agent class.
+from random import randint
+from asteroid import Asteroid
+
+class AsteroidSpawner:
+    display = False
+
+    def __init__(self, board_size):
+        width, height = board_size
+        self.board_width = width
+
+    def play_turn(self, game):
+        game.state['score'] += 1
+        if self.should_spawn_asteroid(game.turn_number):
+            asteroid = Asteroid((randint(0, self.board_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/game.py b/game.py
index 22b5b62..cea0af5 100644
--- a/game.py
+++ b/game.py
@@ -5,4 +5,4 @@ agent = ArrowKeyAgent()
 state = {}
 game = Game([agent], state)
 game.play()
-debug=True
\ No newline at end of file
+
diff --git a/nav_game.py b/nav_game.py
index 191d83d..e6b4085 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 import Asteroid
+from asteroid_spawner import AsteroidSpawner
+
+board_size = (25, 25)
+ship = Spaceship(board_size)
+spawner = AsteroidSpawner(board_size)
+game = Game([ship, spawner], {"score": 0}, board_size=board_size)
+game.play()
+
diff --git a/nav_game_initial_code.py b/nav_game_initial_code.py
new file mode 100644
index 0000000..ae79633
--- /dev/null
+++ b/nav_game_initial_code.py
@@ -0,0 +1,11 @@
+# nav_game.py
+# ------------
+# By MWC Contributors
+# This class implements a simple game where a spaceship avoids asteroids.
+from retro.game import Game
+from spaceship import Spaceship
+
+board_size = (25, 25)
+ship = Spaceship(board_size)
+game = Game([ship], {"score" : 0}, board_size=board_size)
+game.play()
diff --git a/poetry.lock b/poetry.lock
index 098cc0b..d671a52 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -24,13 +24,13 @@ files = [
 
 [[package]]
 name = "babel"
-version = "2.14.0"
+version = "2.15.0"
 description = "Internationalization utilities"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "Babel-2.14.0-py3-none-any.whl", hash = "sha256:efb1a25b7118e67ce3a259bed20545c29cb68be8ad2c784c83689981b7a57287"},
-    {file = "Babel-2.14.0.tar.gz", hash = "sha256:6919867db036398ba21eb5c7a0f6b28ab8cbc3ae7a73a44ebe34ae74a4e7d363"},
+    {file = "Babel-2.15.0-py3-none-any.whl", hash = "sha256:08706bdad8d0a3413266ab61bd6c34d0c28d6e1e7badf40a2cebe67644e2e1fb"},
+    {file = "babel-2.15.0.tar.gz", hash = "sha256:8daf0e265d05768bc6c7a314cf1321e9a123afc328cc635c18622a2f30a04413"},
 ]
 
 [package.extras]
@@ -196,13 +196,13 @@ files = [
 
 [[package]]
 name = "docutils"
-version = "0.20.1"
+version = "0.21.2"
 description = "Docutils -- Python Documentation Utilities"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.9"
 files = [
-    {file = "docutils-0.20.1-py3-none-any.whl", hash = "sha256:96f387a2c5562db4476f09f13bbab2192e764cac08ebbf3a34a95d9b1e4a59d6"},
-    {file = "docutils-0.20.1.tar.gz", hash = "sha256:f08a4e276c3a1583a86dce3e34aba3fe04d02bba2dd51ed16106244e8a923e3b"},
+    {file = "docutils-0.21.2-py3-none-any.whl", hash = "sha256:dafca5b9e384f0e419294eb4d2ff9fa826435bf15f15b7bd45723e8ad76811b2"},
+    {file = "docutils-0.21.2.tar.gz", hash = "sha256:3a6b18732edf182daa3cd12775bbb338cf5691468f91eeeb109deff6ebfa986f"},
 ]
 
 [[package]]
@@ -224,13 +224,13 @@ sphinx-basic-ng = "*"
 
 [[package]]
 name = "idna"
-version = "3.6"
+version = "3.7"
 description = "Internationalized Domain Names in Applications (IDNA)"
 optional = false
 python-versions = ">=3.5"
 files = [
-    {file = "idna-3.6-py3-none-any.whl", hash = "sha256:c05567e9c24a6b9faaa835c4821bad0590fbb9d5779e7caa6e1cc4978e7eb24f"},
-    {file = "idna-3.6.tar.gz", hash = "sha256:9ecdbbd083b06798ae1e86adcbfe8ab1479cf864e4ee30fe4e46a003d12491ca"},
+    {file = "idna-3.7-py3-none-any.whl", hash = "sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0"},
+    {file = "idna-3.7.tar.gz", hash = "sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc"},
 ]
 
 [[package]]
@@ -246,13 +246,13 @@ files = [
 
 [[package]]
 name = "jinja2"
-version = "3.1.3"
+version = "3.1.4"
 description = "A very fast and expressive template engine."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "Jinja2-3.1.3-py3-none-any.whl", hash = "sha256:7d6d50dd97d52cbc355597bd845fabfbac3f551e1f99619e39a35ce8c370b5fa"},
-    {file = "Jinja2-3.1.3.tar.gz", hash = "sha256:ac8bd6544d4bb2c9792bf3a159e80bba8fda7f07e81bc3aed565432d5925ba90"},
+    {file = "jinja2-3.1.4-py3-none-any.whl", hash = "sha256:bc5dd2abb727a5319567b7a813e6a2e7318c39f4f487cfe6c89c6f9c7d25197d"},
+    {file = "jinja2-3.1.4.tar.gz", hash = "sha256:4a3aee7acbbe7303aede8e9648d13b8bf88a429282aa6122a993f0ac800cb369"},
 ]
 
 [package.dependencies]
@@ -357,28 +357,27 @@ files = [
 
 [[package]]
 name = "pygments"
-version = "2.17.2"
+version = "2.18.0"
 description = "Pygments is a syntax highlighting package written in Python."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "pygments-2.17.2-py3-none-any.whl", hash = "sha256:b27c2826c47d0f3219f29554824c30c5e8945175d888647acd804ddd04af846c"},
-    {file = "pygments-2.17.2.tar.gz", hash = "sha256:da46cec9fd2de5be3a8a784f434e4c4ab670b4ff54d605c4c2717e9d49c4c367"},
+    {file = "pygments-2.18.0-py3-none-any.whl", hash = "sha256:b8e6aca0523f3ab76fee51799c488e38782ac06eafcf95e7ba832985c8e7b13a"},
+    {file = "pygments-2.18.0.tar.gz", hash = "sha256:786ff802f32e91311bff3889f6e9a86e81505fe99f2735bb6d60ae0c5004f199"},
 ]
 
 [package.extras]
-plugins = ["importlib-metadata"]
 windows-terminal = ["colorama (>=0.4.6)"]
 
 [[package]]
 name = "requests"
-version = "2.31.0"
+version = "2.32.2"
 description = "Python HTTP for Humans."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
 files = [
-    {file = "requests-2.31.0-py3-none-any.whl", hash = "sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f"},
-    {file = "requests-2.31.0.tar.gz", hash = "sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1"},
+    {file = "requests-2.32.2-py3-none-any.whl", hash = "sha256:fc06670dd0ed212426dfeb94fc1b983d917c4f9847c863f313c9dfaaffb7c23c"},
+    {file = "requests-2.32.2.tar.gz", hash = "sha256:dd951ff5ecf3e3b3aa26b40703ba77495dab41da839ae72ef3c8e5d8e2433289"},
 ]
 
 [package.dependencies]
@@ -442,20 +441,20 @@ files = [
 
 [[package]]
 name = "sphinx"
-version = "7.2.6"
+version = "7.3.7"
 description = "Python documentation generator"
 optional = false
 python-versions = ">=3.9"
 files = [
-    {file = "sphinx-7.2.6-py3-none-any.whl", hash = "sha256:1e09160a40b956dc623c910118fa636da93bd3ca0b9876a7b3df90f07d691560"},
-    {file = "sphinx-7.2.6.tar.gz", hash = "sha256:9a5160e1ea90688d5963ba09a2dcd8bdd526620edbb65c328728f1b2228d5ab5"},
+    {file = "sphinx-7.3.7-py3-none-any.whl", hash = "sha256:413f75440be4cacf328f580b4274ada4565fb2187d696a84970c23f77b64d8c3"},
+    {file = "sphinx-7.3.7.tar.gz", hash = "sha256:a4a7db75ed37531c05002d56ed6948d4c42f473a36f46e1382b0bd76ca9627bc"},
 ]
 
 [package.dependencies]
-alabaster = ">=0.7,<0.8"
+alabaster = ">=0.7.14,<0.8.0"
 babel = ">=2.9"
 colorama = {version = ">=0.4.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.18.1,<0.21"
+docutils = ">=0.18.1,<0.22"
 imagesize = ">=1.3"
 Jinja2 = ">=3.0"
 packaging = ">=21.0"
@@ -468,11 +467,12 @@ sphinxcontrib-htmlhelp = ">=2.0.0"
 sphinxcontrib-jsmath = "*"
 sphinxcontrib-qthelp = "*"
 sphinxcontrib-serializinghtml = ">=1.1.9"
+tomli = {version = ">=2", markers = "python_version < \"3.11\""}
 
 [package.extras]
 docs = ["sphinxcontrib-websupport"]
-lint = ["docutils-stubs", "flake8 (>=3.5.0)", "flake8-simplify", "isort", "mypy (>=0.990)", "ruff", "sphinx-lint", "types-requests"]
-test = ["cython (>=3.0)", "filelock", "html5lib", "pytest (>=4.6)", "setuptools (>=67.0)"]
+lint = ["flake8 (>=3.5.0)", "importlib_metadata", "mypy (==1.9.0)", "pytest (>=6.0)", "ruff (==0.3.7)", "sphinx-lint", "tomli", "types-docutils", "types-requests"]
+test = ["cython (>=3.0)", "defusedxml (>=0.7.1)", "pytest (>=6.0)", "setuptools (>=67.0)"]
 
 [[package]]
 name = "sphinx-basic-ng"
@@ -585,6 +585,17 @@ lint = ["docutils-stubs", "flake8", "mypy"]
 standalone = ["Sphinx (>=5)"]
 test = ["pytest"]
 
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
+
 [[package]]
 name = "urllib3"
 version = "2.2.1"
diff --git a/spaceship.py b/spaceship.py
index 9f3552a..5f35715 100644
--- a/spaceship.py
+++ b/spaceship.py
@@ -2,3 +2,24 @@
 # ------------
 # By MWC Contributors
 # This module defines a spaceship agent class.
+class Spaceship:
+    name = "ship"
+    character = 'v'
+
+    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()
+