diff --git a/2015/day23.py b/2015/day23.py
new file mode 100644
index 0000000..f5fbd33
--- /dev/null
+++ b/2015/day23.py
@@ -0,0 +1,27 @@
+with open('day23-input', 'r') as file:
+  data = [l.strip('\n') for l in file]
+
+tokens = [line.replace(',', '').split() for line in data]
+
+def run_program(registers):
+  i = 0
+  while i < len(tokens):
+    line = tokens[i]
+    if line[0] == 'jmp':
+      i += int(line[1])
+    elif line[0] == 'jie':
+      i += int(line[2]) if registers[line[1]] % 2 == 0 else 1
+    elif line[0] == 'jio':
+      i += int(line[2]) if registers[line[1]] == 1 else 1
+    else:
+      i += 1
+      if line[0] == 'inc':
+        registers[line[1]] += 1
+      elif line[0] == 'hlf':
+        registers[line[1]] //= 2
+      elif line[0] == 'tpl':
+        registers[line[1]] *= 3
+  return registers
+
+print(run_program({'a': 0, 'b': 0}))  # b is Part 1
+print(run_program({'a': 1, 'b': 0}))  # b is Part 2