diff --git a/puzzles/Y2015/D4/p1.py b/puzzles/Y2015/D4/p1.py
new file mode 100644
index 0000000..96d0a04
--- /dev/null
+++ b/puzzles/Y2015/D4/p1.py
@@ -0,0 +1,12 @@
+import hashlib
+from typing import Any
+
+
+def puzzle(input: str) -> Any:
+    input = input.strip()
+    i = 0
+    while True:
+        hash_hex_string = hashlib.md5((input + str(i)).encode()).hexdigest()
+        if hash_hex_string[:5] == "00000":
+            return i
+        i += 1
diff --git a/puzzles/Y2015/D4/p2.py b/puzzles/Y2015/D4/p2.py
new file mode 100644
index 0000000..845f58b
--- /dev/null
+++ b/puzzles/Y2015/D4/p2.py
@@ -0,0 +1,12 @@
+import hashlib
+from typing import Any
+
+
+def puzzle(input: str) -> Any:
+    input = input.strip()
+    i = 0
+    while True:
+        hash_hex_string = hashlib.md5((input + str(i)).encode()).hexdigest()
+        if hash_hex_string[:6] == "000000":
+            return i
+        i += 1