diff --git a/challenges/2021/10-syntaxScoring/README.md b/challenges/2021/10-syntaxScoring/README.md
new file mode 100644
index 0000000..4a32b7d
--- /dev/null
+++ b/challenges/2021/10-syntaxScoring/README.md
@@ -0,0 +1,2 @@
+# [Day 10: Syntax Scoring](https://adventofcode.com/2021/day/10)
+
diff --git a/challenges/2021/10-syntaxScoring/benchmark.json b/challenges/2021/10-syntaxScoring/benchmark.json
new file mode 100644
index 0000000..2029846
--- /dev/null
+++ b/challenges/2021/10-syntaxScoring/benchmark.json
@@ -0,0 +1,15 @@
+{
+  "day": 10,
+  "dir": "challenges/2021/10-syntaxScoring",
+  "implementations": {
+    "Python": {
+      "part.1.avg": 0.0013953149318695068,
+      "part.1.max": 0.003077268600463867,
+      "part.1.min": 0.0008635520935058594,
+      "part.2.avg": 0.0033985512256622316,
+      "part.2.max": 0.0085296630859375,
+      "part.2.min": 0.0021257400512695312
+    }
+  },
+  "numRuns": 1000
+}
\ No newline at end of file
diff --git a/challenges/2021/10-syntaxScoring/info.json b/challenges/2021/10-syntaxScoring/info.json
new file mode 100644
index 0000000..7185655
--- /dev/null
+++ b/challenges/2021/10-syntaxScoring/info.json
@@ -0,0 +1,17 @@
+{
+    "inputFile": "input.txt",
+    "testCases": {
+        "one": [
+            {
+                "input": "[({(<(())[]>[[{[]{<()<>>\n[(()[<>])]({[<{<<[]>>(\n{([(<{}[<>[]}>{[]{[(<()>\n(((({<>}<{<{<>}{[]{[]{}\n[[<[([]))<([[{}[[()]]]\n[{[{({}]{}}([{[{{{}}([]\n{<[[]]>}<{[{[{[]{()[[[]\n[<(<(<(<{}))><([]([]()\n<{([([[(<>()){}]>(<<{{\n<{([{{}}[<[[[<>{}]]]>[]]\n",
+                "expected": "26397"
+            }
+        ],
+        "two": [
+            {
+                "input": "[({(<(())[]>[[{[]{<()<>>\n[(()[<>])]({[<{<<[]>>(\n{([(<{}[<>[]}>{[]{[(<()>\n(((({<>}<{<{<>}{[]{[]{}\n[[<[([]))<([[{}[[()]]]\n[{[{({}]{}}([{[{{{}}([]\n{<[[]]>}<{[{[{[]{()[[[]\n[<(<(<(<{}))><([]([]()\n<{([([[(<>()){}]>(<<{{\n<{([{{}}[<[[[<>{}]]]>[]]\n",
+                "expected": "288957"
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/challenges/2021/10-syntaxScoring/py/__init__.py b/challenges/2021/10-syntaxScoring/py/__init__.py
new file mode 100644
index 0000000..b706a2a
--- /dev/null
+++ b/challenges/2021/10-syntaxScoring/py/__init__.py
@@ -0,0 +1,120 @@
+from typing import List, Optional, Tuple
+from aocpy import BaseChallenge
+from dataclasses import dataclass
+import math
+
+
+CHECKER_POINTS = {
+    ")": 3,
+    "]": 57,
+    "}": 1197,
+    ">": 25137,
+}
+
+AC_POINTS = {
+    ")": 1,
+    "]": 2,
+    "}": 3,
+    ">": 4,
+}
+
+
+@dataclass
+class Chunk:
+    text: str
+
+    def is_corrupted(self) -> Tuple[bool, Optional[str]]:
+        stack = []
+        for char in self.text:
+
+            if char == "(":
+                stack.append(")")
+            elif char == "[":
+                stack.append("]")
+            elif char == "{":
+                stack.append("}")
+            elif char == "<":
+                stack.append(">")
+            elif char == ")" or char == "]" or char == "}" or char == ">":
+                r = stack.pop()
+                if r != char:
+                    return True, char
+            else:
+                raise ValueError(f"unknown character in chunk string ({char=})")
+
+        return False, None
+
+    def complete(self) -> str:
+        stack = []
+        output = ""
+
+        n = 0
+        while True:
+
+            char = None 
+            if n < len(self.text):
+                char = self.text[n]
+
+            if len(stack) == 0 and char is None:
+                break
+
+            if char is None:
+                output += stack.pop()
+            elif char == "(":
+                stack.append(")")
+            elif char == "[":
+                stack.append("]")
+            elif char == "{":
+                stack.append("}")
+            elif char == "<":
+                stack.append(">")
+            elif char == ")" or char == "]" or char == "}" or char == ">":
+                r = stack.pop()
+                if r != char:
+                    raise ValueError(f"cannot correct corrupted chunk (wanted {r}, got {char})")
+            else:
+                raise ValueError(f"unknown character in chunk string ({char=})")
+
+            n += 1
+
+        return output
+
+
+def parse(instr: str) -> List[Chunk]:
+    return [Chunk(x) for x in instr.strip().splitlines()]
+
+
+class Challenge(BaseChallenge):
+
+    @staticmethod
+    def one(instr: str) -> int:
+        chunks = parse(instr)
+        score = 0
+        for chunk in chunks:
+            is_corrupted, illegal_character = chunk.is_corrupted()
+            if is_corrupted:
+                score += CHECKER_POINTS[illegal_character]
+        return score
+
+    @staticmethod
+    def two(instr: str) -> int:
+        chunks = parse(instr)
+
+        def f(x):
+            y, _ = x.is_corrupted()
+            return not y
+        
+        chunks = list(filter(f, chunks))
+        points = []
+        for chunk in chunks:
+            extra = chunk.complete()
+            n = 0
+            for char in extra:
+                n *= 5
+                n += AC_POINTS[char]
+            points.append(n)
+
+        points = list(sorted(points))
+        median = points[math.floor(len(points)/2)]
+
+        return median
diff --git a/challenges/2021/README.md b/challenges/2021/README.md
index 5903870..451a6a4 100644
--- a/challenges/2021/README.md
+++ b/challenges/2021/README.md
@@ -18,7 +18,8 @@ Solutions to the [2021 Advent of Code](https://adventofcode.com/2021).
 | 06 - Lanternfish                    | Complete           | [Python](06-lanternfish/py)                                                                             | At this rate, the mass of the fish would surpass that of the Earth pretty quickly.                                                  |
 | 07 - The Treachery of Whales        | Complete           | [Python](07-theTreacheryOfWhales/py)                                                                    | I'm not 100% sure my solution for part two is valid for all possible inputs.                                                        |
 | 08 - Seven Segment Search           | Complete           | [Python](08-sevenSegmentSearch/py), [Go](08-sevenSegmentSearch)                                         | I may have taken the easy way out for part two, but it does work! No-one ever said the smart solution is the best solution, anyway. |
-| 09 - Smoke Basin *                  | Complete           | [Python](09-smokeBasin/py)                                                                              | Schmokey! Also, as it turns out, I struggle to implement basic logic. Fun.                                                          |
+| 09 - Smoke Basin \*                 | Complete           | [Python](09-smokeBasin/py)                                                                              | Schmokey! Also, as it turns out, I struggle to implement basic logic. Fun.                                                          |
+| 10 - Syntax Scoring                 | Complete           | [Python](10-syntaxScoring/py)                                                                           | I can't say I've ever broken something so thoroughly that it has a syntax error on *every* line...                                  |
 
 <!-- PARSE END -->
 
diff --git a/challenges/2021/running-times.png b/challenges/2021/running-times.png
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