diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2466af6
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "8bkc-sudoku"]
+	path = 8bkc-sudoku
+	url = https://github.com/superloach/8bkc-sudoku
diff --git a/8bkc-sudoku b/8bkc-sudoku
new file mode 160000
index 0000000..d8671c5
--- /dev/null
+++ b/8bkc-sudoku
@@ -0,0 +1 @@
+Subproject commit d8671c57d0aca9ea8dacbe38144d61023e95b732