diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..23baccf
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,134 @@
+[[package]]
+name = "atomicwrites"
+version = "1.4.1"
+description = "Atomic file writes."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "22.1.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
+
+[[package]]
+name = "colorama"
+version = "0.4.5"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "more-itertools"
+version = "8.14.0"
+description = "More routines for operating on iterables, beyond itertools"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "packaging"
+version = "21.3"
+description = "Core utilities for Python packages"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
+
+[[package]]
+name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+
+[[package]]
+name = "py"
+version = "1.11.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "pygame"
+version = "2.1.2"
+description = "Python Game Development"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "pyparsing"
+version = "3.0.9"
+description = "pyparsing module - Classes and methods to define and execute parsing grammars"
+category = "dev"
+optional = false
+python-versions = ">=3.6.8"
+
+[package.extras]
+diagrams = ["railroad-diagrams", "jinja2"]
+
+[[package]]
+name = "pytest"
+version = "5.4.3"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
+optional = false
+python-versions = ">=3.5"
+
+[package.dependencies]
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=17.4.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+more-itertools = ">=4.0.0"
+packaging = "*"
+pluggy = ">=0.12,<1.0"
+py = ">=1.5.0"
+wcwidth = "*"
+
+[package.extras]
+checkqa-mypy = ["mypy (==v0.761)"]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
+
+[[package]]
+name = "wcwidth"
+version = "0.2.5"
+description = "Measures the displayed width of unicode strings in a terminal"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.10"
+content-hash = "91473432988ec8e00b52a48dc2e8c67afca503f9c51f4ad2811349546b339b79"
+
+[metadata.files]
+atomicwrites = []
+attrs = []
+colorama = []
+more-itertools = []
+packaging = []
+pluggy = []
+py = []
+pygame = []
+pyparsing = []
+pytest = []
+wcwidth = []
diff --git a/pyproject.toml b/pyproject.toml
index 4fa142c..a1da413 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,7 @@ authors = ["Marc Partensky <marc.partensky@gmail.com>"]
 
 [tool.poetry.dependencies]
 python = "^3.10"
+pygame = "^2.1.2"
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"