diff --git a/input/2021/day11-sample1.txt b/input/2021/day11-sample1.txt
new file mode 100644
index 0000000..03743f6
--- /dev/null
+++ b/input/2021/day11-sample1.txt
@@ -0,0 +1,10 @@
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
diff --git a/input/2021/day11-sample2.txt b/input/2021/day11-sample2.txt
new file mode 100644
index 0000000..ae21dd2
--- /dev/null
+++ b/input/2021/day11-sample2.txt
@@ -0,0 +1,5 @@
+11111
+19991
+19191
+19991
+11111
diff --git a/input/2021/day11.txt b/input/2021/day11.txt
new file mode 100644
index 0000000..64dcfab
--- /dev/null
+++ b/input/2021/day11.txt
@@ -0,0 +1,10 @@
+5665114554
+4882665427
+6185582113
+7762852744
+7255621841
+8842753123
+8225372176
+7212865827
+7758751157
+1828544563