diff --git a/2018/day12-input b/2018/day12-input
new file mode 100644
index 0000000..30f7084
--- /dev/null
+++ b/2018/day12-input
@@ -0,0 +1,34 @@
+initial state: ###.......##....#.#.#..###.##..##.....#....#.#.....##.###...###.#...###.###.#.###...#.####.##.#....#
+
+..... => .
+#..## => .
+..### => #
+..#.# => #
+.#.#. => .
+####. => .
+##.## => #
+#.... => .
+#...# => .
+...## => .
+##..# => .
+.###. => #
+##### => #
+#.#.. => #
+.##.. => #
+.#.## => .
+...#. => #
+#.##. => #
+..#.. => #
+##... => #
+....# => .
+###.# => #
+#..#. => #
+#.### => #
+##.#. => .
+###.. => #
+.#### => .
+.#... => #
+..##. => .
+.##.# => .
+#.#.# => #
+.#..# => .
diff --git a/2018/day12-inputtest b/2018/day12-inputtest
new file mode 100644
index 0000000..864fa0c
--- /dev/null
+++ b/2018/day12-inputtest
@@ -0,0 +1,16 @@
+initial state: #..#.#..##......###...###
+
+...## => #
+..#.. => #
+.#... => #
+.#.#. => #
+.#.## => #
+.##.. => #
+.#### => #
+#.#.# => #
+#.### => #
+##.#. => #
+##.## => #
+###.. => #
+###.# => #
+####. => #
diff --git a/2018/day12.py b/2018/day12.py
new file mode 100644
index 0000000..46cb06d
--- /dev/null
+++ b/2018/day12.py
@@ -0,0 +1,34 @@
+with open('day12-input', 'r') as file:
+  data = [l.strip('\n') for l in file]
+import numpy as np
+import re
+
+# numbers = np.array([[int(s) for s in re.findall(r'-?\d+', d)] for d in data], dtype=np.int64)
+max_gens = 50000000000
+
+initial_state = np.array([0 if s=='.' else 1 for s in data[0].split()[-1]])
+rules = [np.array([0 if s=='.' else 1 for s in d.split()[0]]+[0 if s=='.' else 1 for s in d.split()[-1]]) for d in data[2:]]
+
+
+l = len(initial_state)
+state = np.zeros(l*20, dtype=np.int64)
+state[l*10:l*11] = initial_state
+last_state = state.copy()
+pots = np.arange(-l*10, l*10)
+
+for gen in range(max_gens):
+  print(''.join(['#' if s else '.' for s in state[l*10-2:l*11+5]]), gen, max_gens-gen)
+  for plant in range(2, len(state)-2):
+    s = last_state[plant-2:plant+3]
+    matched = False
+    for rule in rules:
+      if np.array_equal(rule[:-1], s):
+        state[plant] = rule[-1]
+        # print('Matched!', rule)
+        matched = True
+        break
+    if not matched:
+      state[plant] = 0
+  last_state[:] = state[:]
+
+print(pots[state > 0].sum())