diff --git a/2018/day-10/input b/2018/day-10/input
new file mode 100644
index 0000000..e69de29
diff --git a/2018/day-10/python/main.py b/2018/day-10/python/main.py
new file mode 100644
index 0000000..e69de29
diff --git a/2018/day-9/input b/2018/day-9/input
index e69de29..0458ff4 100644
--- a/2018/day-9/input
+++ b/2018/day-9/input
@@ -0,0 +1 @@
+419 players; last marble is worth 72164 points
\ No newline at end of file
diff --git a/2018/day-9/python/main.py b/2018/day-9/python/main.py
index e69de29..95237fa 100644
--- a/2018/day-9/python/main.py
+++ b/2018/day-9/python/main.py
@@ -0,0 +1,30 @@
+import os
+import sys
+import re
+
+from collections import deque, defaultdict
+
+RE_PATTERN = "(\d+) players; last marble is worth (\d+) points"
+PATH = os.path.join(sys.path[0], '..', 'input')
+MATCH = re.match(RE_PATTERN, open(PATH, 'r').read())
+
+PLAYERS = int(MATCH.group(1))
+LAST_MARBLE = int(MATCH.group(2))
+
+def game(players, last_marble):
+    circle = deque([0])
+    scores = defaultdict(int)
+
+    for marble in range(1, last_marble + 1):
+        if marble % 23 == 0:
+            circle.rotate(7)
+            scores[marble % players] += marble + circle.pop()
+            circle.rotate(-1)
+        else:
+            circle.rotate(-1)
+            circle.append(marble)
+
+    print(max(scores.values()))
+
+game(PLAYERS, LAST_MARBLE)
+game(PLAYERS, LAST_MARBLE * 100)
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