diff --git a/challenges/2024/03-mullItOver/README.md b/challenges/2024/03-mullItOver/README.md
new file mode 100644
index 0000000..95586d4
--- /dev/null
+++ b/challenges/2024/03-mullItOver/README.md
@@ -0,0 +1 @@
+# [Day 3: Mull It Over](https://adventofcode.com/2024/day/3)
diff --git a/challenges/2024/03-mullItOver/main.py b/challenges/2024/03-mullItOver/main.py
new file mode 100644
index 0000000..2406f44
--- /dev/null
+++ b/challenges/2024/03-mullItOver/main.py
@@ -0,0 +1,61 @@
+import sys
+import re
+
+
+Instruction = tuple[str, int, int]
+
+
+def parse(instr: str) -> list[Instruction]:
+    r = re.compile(r"(mul)\((\d{1,3}),(\d{1,3})\)|(do)\(\)|(don't)\(\)")
+    res = []
+    for m in r.findall(instr):
+        if m[0]:
+            res.append(("mul", int(m[1]), int(m[2])))
+        elif m[3]:
+            res.append(("do", 0, 0))
+        elif m[4]:
+            res.append(("don't", 0, 0))
+    return res
+
+
+def one(instr: str):
+    instructions = parse(instr)
+
+    acc = 0
+    for (op, a, b) in instructions:
+        if op == "mul":
+            acc += a * b
+
+    return acc
+
+
+def two(instr: str):
+    instructions = parse(instr)
+
+    acc = 0
+    on = True
+    for (op, a, b) in instructions:
+        if op == "mul" and on:
+            acc += a * b
+        elif op == "do":
+            on = True
+        elif op == "don't":
+            on = False
+
+    return acc
+
+
+def _debug(*args, **kwargs):
+    kwargs["file"] = sys.stderr
+    print(*args, **kwargs)
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2 or sys.argv[1] not in ["1", "2"]:
+        print("Missing day argument", file=sys.stderr)
+        sys.exit(1)
+    inp = sys.stdin.read().strip()
+    if sys.argv[1] == "1":
+        print(one(inp))
+    else:
+        print(two(inp))
diff --git a/challenges/2024/03-mullItOver/tests.json b/challenges/2024/03-mullItOver/tests.json
new file mode 100644
index 0000000..582693e
--- /dev/null
+++ b/challenges/2024/03-mullItOver/tests.json
@@ -0,0 +1,14 @@
+{
+    "1": [
+        {
+            "is": "161",
+            "input": "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))\n"
+        }
+    ],
+    "2": [
+        {
+            "is": "48",
+            "input": "xmul(2,4)&mul[3,7]rundon't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))\n"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/challenges/2024/benchmark-graph.png b/challenges/2024/benchmark-graph.png
index b7d39c4..9b0aa14 100644
Binary files a/challenges/2024/benchmark-graph.png and b/challenges/2024/benchmark-graph.png differ
diff --git a/challenges/2024/benchmarks.jsonl b/challenges/2024/benchmarks.jsonl
index 9a3f7af..66053fb 100644
--- a/challenges/2024/benchmarks.jsonl
+++ b/challenges/2024/benchmarks.jsonl
@@ -2,3 +2,5 @@
 {"day": 1, "part": 2, "runner": "py", "min": 0.0161440372467041, "max": 0.019031047821044922, "avg": 0.016828114986419677, "n": 100}
 {"day": 2, "part": 1, "runner": "py", "min": 0.021907567977905273, "max": 0.02720332145690918, "avg": 0.023289167881011964, "n": 100}
 {"day": 2, "part": 2, "runner": "py", "min": 0.02489948272705078, "max": 0.0319674015045166, "avg": 0.026371052265167238, "n": 100}
+{"day": 3, "part": 1, "runner": "py", "min": 0.02116227149963379, "max": 0.03153491020202637, "avg": 0.022634525299072266, "n": 100}
+{"day": 3, "part": 2, "runner": "py", "min": 0.02115607261657715, "max": 0.03121805191040039, "avg": 0.022722084522247315, "n": 100}