diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..c8905a50
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "playground/deno-quadtree"]
+	path = playground/deno-quadtree
+	url = https://github.com/Izumi-No/meu-primeiro-jogo-multiplayer-quadtree.git
diff --git a/playground/deno-quadtree b/playground/deno-quadtree
new file mode 160000
index 00000000..ffac4c85
--- /dev/null
+++ b/playground/deno-quadtree
@@ -0,0 +1 @@
+Subproject commit ffac4c85a9a66e13697222a3d67f221447ab32f1