diff --git a/2021/inputs/21.txt b/2021/inputs/21.txt
new file mode 100644
index 0000000..f44ac43
--- /dev/null
+++ b/2021/inputs/21.txt
@@ -0,0 +1,2 @@
+Player 1 starting position: 9
+Player 2 starting position: 4
diff --git a/2021/src/samples/21.txt b/2021/src/samples/21.txt
new file mode 100644
index 0000000..3f69194
--- /dev/null
+++ b/2021/src/samples/21.txt
@@ -0,0 +1,2 @@
+Player 1 starting position: 4
+Player 2 starting position: 8