diff --git a/advent-of-code-2021.csproj b/advent-of-code-2021.csproj
index 8179d27..a1b53cc 100644
--- a/advent-of-code-2021.csproj
+++ b/advent-of-code-2021.csproj
@@ -42,6 +42,9 @@
 	  <None Update="inputs\09.txt">
 	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 	  </None>
+	  <None Update="inputs\10.txt">
+	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+	  </None>
 	</ItemGroup>
 
 </Project>
diff --git a/inputs/10.txt b/inputs/10.txt
new file mode 100644
index 0000000..e287065
--- /dev/null
+++ b/inputs/10.txt
@@ -0,0 +1,94 @@
+{{<{{{{([{[([[()<>]{<>{}}]<([]())(()<>)>)((({}())[()[]])<<[][]>[{}[]]>)]{{(<{}<>>{<><>}]([<>[]]<
+[(<{{[{(<({{<<[]()><<>{}>>([<>[]]{<><>})}})>)}]}}>[{(<{({[{[[({}())((){})]({{}[]})]<<[<>{}]([][])>({<>()}
+(({<{[{({(([[([]())({}())]]({[[]{}]([][]))<((){})<{}<>>>))[(([<>[]]<[]>)(([]{}){{}{}}))])})[({<[{
+([{{[([<({<<<([]())[()[]]>{<()[]>[[]()]}>[{<[]{}><[]>>{<<>()>{[]()}}]>[[[[[]{}]([]<>)]<{<>{}}
+[[((<({<(<{<<{{}()}{[][]}>[((){})]>}>{((<({}<>)<{}()>>[[<>()]])<<<[][]><<>[]>>{<{}[]>(<>())}>)<{[[{
+[{<{{{{<([{[(<[]<>>(<>[])){({}<>)([]<>)}]{{([][])[<>{}]}{<[]<>>(<>{})}}}])<<{[<[<>{}]<(){}>>{<{}<>><<>
+(({({([(<[[([[{}{}]([]<>}][(<>()){(){}}])]](({{{{}<>}<{}[]>}([{}[]][(){}])}[(<[]{}>({}()))<<<><>>>])<[{
+[{<((<{(<{<<{[()()](()<>)}<({}[])([]<>)>>{(<<><>>[[]{}])[[[]()](<>[])]}>{[[({}<>)([]<>)][[{}[]
+{<{<{{(<[[{[[({}[])[()[]]]([()<>][{}[]])]<<({}())[{}{}]><[<>[]](<><>)>>}(([([]{})((){})]((<>)([]{}))))]<{<<<
+<{(<<(<[<{<[{[<>[]][{}{}]}{{()<>}{<><>}>]>[<(([]{})[[]])>]}<[<([{}{}][<><>]){([]{})}>]({<{<>()}>{
+{[[<{{{<<<[<((()<>)({}{}))<{{}()}>>]<((([]{}){{}<>})[{{}<>}([]{})])({{()[]}[[]()]}[{{}()}({
+<[[[{{([{[({[<{}[]>[{}()]]{<()>}}({<()()>}<<<>()>{[]}>))]((({({}[])>{[(){}]{<><>}})(({()[]}[()<>]
+[([([([<[{{<[[{}[]]{<>{}}][<{}>(()[])]>[({<>()}(()[])){<[][]>{()[]}}]}}<{(({()}([]()))(([]())<()[]>))<((<>{}
+<{[{(({([([[{((){})[[]]>{{{}[]}[<>()]}]])]{([([<[]{}>((){})]<[()<>]<()()>>)][<<{<>{}}{<><>
+[[{{(([{(({[[{{}[]}]][<<<>()>({}{})>[[{}<>]{{}<>}]]}[(({{}}{[][]}){[{}{}][<>[]]})(<<<>{}><<><>>>)])<[
+[[{([<<([[<(<{<>()}<[][]>>{[<>[]]{()[]}}){[<[][]><{}()>][([]())<<><>>]}>]((<<[(){}][(){}]><([])>>))
+[{[<{(([(([([(<>[]}(<>{})][<{}[]>[()[]]])<{[{}<>]<[]<>>}{{[]<>}{{}{}}}>]<<{[<>{}](<>())}{{()[]}{<>{}}}>[
+{({<[(((<{<<[[()<>]]<({}<>)>>>[<({[]<>}{()<>})[[()<>][<><>]]>({[{}[]]({}<>)}[<(){}>(<>())])]}><[{<[[<>
+<(((({{(<({[<<[]<>>>([()()]{<>()})][<[{}{}]{<>()}>{{{}{}}[[][]]}]}{(<<<><>>(()<>)>(<<>()>[()[]]))
+[<{{[{[[[<(({<()()>[(){}]}[([]())[(){}]]))>{[<[[[]]<[][]>]{[[][]](()())}>[(<<>()>{[]<>})(({}())<{}[]>)
+(<[[((<<({[(([()[]]([]<>)){{(){}}})]{<(<<><>><[]{}>)<<{}<>]([]<>)>>}}){(<{<{[]{}}[{}<>]>}>{({(<><>)<()[]>}{((
+{[{((<{<<<<([<[]{}>[[][]]]<[[]()][<>[]]>)[[<{}[]>{{}()}](<()<>>[<>[]])]>>[{([<()[]>{{}[]}](({}{}
+(<([<((<{[<<(((){})<<><>>)<[{}()]<[]<>>}>[([[]{}](()[]))]>[<{({}()){{}()}}>[(([]<>)({}[])){
+{((((<(({[(<{<()]([][])}>){[<[[][]]>]<{{{}<>}[[][]]}>}]}[<{([{[]{}}]{[(){}]<<>()>})[(<()<>>{()<>
+<<{([{<[[[<{([[]<>]){[<>()][(){}]}}[{(()[])[()[]]}]>][{{[{{}[]}<()<>>]>[[{(){}}[<>[]]][[<>[]]({}()
+<((<[<(([<[{({<><>}(()[]))}]<[<[{}()]<()[]>>(<()()>)][[(<>())<()())]<{<>}<{}>>]>>({{<<<>[]><<>(
+[({{{{{{(([[<<()()><<>[]>>[{[]<>}]]{(<{}<>>(()[]))<<[][]>(()())>}]([<({}()><[][]>>]<{[[][]]<[]<>>}(
+(<(<{{<[{{{[<[<>[]]<[]{}>>[{<>{}}{()()}]]{<<{}()>(<>())>[[{}[]]]}}}}][{([{[([]{})<()[]>][[<>{}]{()[]}]}(([()
+{[<<(<<<{[<<<<[]<>><()[]>>[({}[])[[]<>]]><((<><>)[{}<>])[{{}{}}[[]()]]>>{{{[<><>]<<>()>}[<[]{}>([][])]
+<(<{<(<({[[{((()[])[{}<>])([<>()]>}{[({}{})[(){}]]<[()<>]({}[])>}]{[<{[]{}}><{[]{}}[[][]]>][[<{}<>><()[]>]<[
+{<({[<((<<<{{([]<>}{<><>}}<{<>{}}[[]<>]>}>{<[{{}}(()())]>}>(<<{[(){}]<()[]>}({(){}}[()<>])>[<<<>[]>{[]
+{(({<{{{{{((<{[]<>>(<>{})>[[<>()]])<<(()())[<>]><[(){}][{}{}]>>)}({([[[]]]{<{}{}><()[]>})<{[(){}][[]()]}>
+<<[<<[((({[[(<{}[]>({}())){[()()]}][{{<>{}}<<>()>}[<{}[]>[<>[]]]]]{<(([]())([]()))>{([()()]<<>[]>)[<
+{([<<<({((<{{[<>[]][<>{}]}<<<>[]>[[][]]>}[{[()[]]<<>[]>}<[{}{}]<<><>>>]>({[<[]<>>]<<()()>([][])>}(((<
+(<{<((<{[[<[(<[]{}>{<>{}})][<([][])[{}<>]>[<{}<>>]]><<[(<>[])[{}<>]]{<{}{}><{}[]>}>(<([]<>){()[]}>)>]]}{({[<(
+[{{(({<<<<{{<({}()){{}{}}>[(()[])]}[([(){}]{<>[]})[(<>())[{}]]]}>[<<<{[]{}}{{}{}}>]{<[{}<>]>{(()())}}>[{(<[]<
+{[<<{<[[({{<<{()[]}<<><>>>([[]<>>[{}[]])>}[[[([]<>)[<>{}]]]<<[<>()](<>{})>>]})(((({({}[])<<><>>}([<>])))((<
+[{(({({<({(<{{[][]}({}<>)}[{()()}{[][]}]>(((<><>)(<>()))([{}()][{}()])))([{[[]()]<[]{}>}{(
+{<{{<[<<[(<([({}())[{}()]]{{{}<>}<[]>}){[((){})<[][]>]<([]())({}[])>}>{<(((){})[()<>])(<()[]>[(){}]
+{({({<{{(<([<[<><>]((){})>{{()[]}<<>{}>}]{[(<>())<{}[]>][{()<>}[[]()]>})>[[<{([])[()[]]}><<[(){}]({}())>>]{
+(<{{(<<<{(<(({<><>}{()[]})<[{}[]]([]())>)([(()<>)[[]<>]]({[]()}{{}{}}))))[(<{{()[]}<()[]>}((<><>))>[[
+<<[<([{<<[[({<[]<>><<>()>}{([]<>)[[]<>]}){[<{}{}><()[]>]<{<>()}{<>()}>}]{{<({}{})>})]>[<({<
+(<<[[({[({(<{{[]{}}<[]{}}}>[<<()<>><{}<>>>(<()()>{{}<>})])}{<({({}[])<()>}<([]())<{}<>>>)<<[(
+[<(<{(([(<([[<<>{}>(<>{})]](((()[])[[]()])[[{}<>]({}{})]))><<{<([]<>){[][]}>[{<>[]}<()<>>]}>(<((<>[]){()<>}
+[<{[[{(([[{[{<[]<>>(<>[])}<<<>()>{{}{}}>][({[][]}<<>>){(<>[])[<><>]}]}(([([][])(<>[])]{(()())}))](<<{
+((<{<<([<[(([{()()}((){})][<()[]><()[]>])<{({}<>){{}<>}}>)[{(<<><>>)<{{}[]}>}({(<>()){()}}{([
+[({{{{((([({{(<>[])[[]<>]}([{}])}(({<><>}{<>()})[[{}[]]]))<{[[<>{}](()[])](<()<>>{[]()})}{{<()()
+[<[<({[[({[[[<<>[]>]({[]}[<><>])]{[[()<>]([]())]<({}{})[[][]]>}]}<<(([()()]<()<>>)<{()()}[()[]]>
+{<([[<[<<(([<(()[])(()<>)>{[<><>](<>[])]]{({{}})}){<((<><>)<{}<>>)((()[])[[]()])>})<<(<(())(
+<[<((<{(<[[({{{}()}({}{})}}<[[()<>]]<[()()][<>]>>]<[([()()]({}<>))[<{}()>([]<>)]]>][{[[(()())[()]][[<>[]
+[{(<(<[((<{(({(){}}[()[]])<{[][]}(<>{})>)[(<<><>>[()[]]]{[{}[]]{()<>}}]}><[<[[{}()](()[])][(<>()){<>()}]>[{
+([({<({{{[[<[{{}<>}([][])]{[(){}]{()<>}}>][{[{[]<>}][<{}()>]}]]}{((<[{{}[]}(()()))[{<>[]}]>({(<>{})<[]<>>}
+{[({[<[([(<{((<>{})<{}{}>)}(<[[]()]<{}{}>>({{}[]}{[]<>}))><[((()[])(())){([]<>)[()[]]}]<({()
+[(<<<([{[[[<<<<>>{{}<>}>[{[]()}]>[([[]{}]{[]<>}){[<>()]}]]]]}]<<((<([{[][]}<{}<>>]<[[]{}][[]<>])){{[<>[]
+{[{{[[{{[<[<<{{}<>}<[]{}>><<()[]>[<>[]]>>[([<>{}](()()))]]>{({([{}[]](<><>))<<(){}>(<>{})>}({([]<>)[{}[])}(<<
+<{([[{<[<{{([(<>{})[<>()]]){{[()[]]([])}}}[{<((){})([]())>}(<{[][]}<<>{}>>[[[][]]<()()>])]}>[
+{(<[({{(<<<{[(()())]<[<>[]][{}{}]>}[[<()[]>{[][]}]]>(<((<>())[()[]]){{()[]}{[][]}}>({{[]<>}<[][]>}(<[]{}
+<{{[{((((<[{({[]{}}<(){}>)}[[{[][]}<<>{}>]<<[][]>{[]}>]]>{{([((){})<<>{}>]{{()()}})<[<<>()>](<<>>[()
+<([({(<<<{[<{(()<>)(<>[])}([<>]{<>{}})>]<(<<<><>><{}()>>[([][]){[]<>}])>}{[([[[]<>]{(){}}]<[{}<>]{{}<>}
+{<<<[{[(<[([([[]()]<()[]>)(([]())({}[]))]<[[()<>]]<[(){}]<[][]>>>)(<{<[][]>)<(()<>)<{}[]>>
+{[[<[[<(<[[{(<()<>>)<{{}<>}[[][]]>}<<(()()){[]{}}>{<[]()>>>]]>)({<<<<[{}{}]{<>()}>{<<><>>([]{})}>>[([<()()>(
+[[[{({{({[{[(({}())(<>[]))<<<>[]>[[]<>]>]<<<()()><<>>>[({}())(<>[])]>}[({<(){}>({}{})}[[{}()]]){[[[]<>
+<(((<<[{[[<({({}<>)[{}()]}[{[]{}}([]())]){([[]<>]<[]<>>)[(()[])[{}[]]]}>(<<<{}[]><()[]>)>[[<{}(
+[<<{[{{<<[[{<<()[]>(())><<{}()][<>()]>}({[{}{}][<>()]}<([]())([])>)]({{{[][]}[<>{}]}<[()]{{}()}>}(({
+{([(<[[<(<<<(<<><>><{}<>>)({{}()}[<>()])>{([(){}][[][]]){[<><>]{<><>}}}>>(({(<<><>><()<>>){{()<>}{(){}}}}
+[(<([[[([(({[[<>[]]]}))([{{[{}()]([]<>)}{{<>[]}[[][]]}}(<([]())>[([]{}){()<>}])][<{<()[]><()()>}>{<([
+{([[<<[[<[[[<[{}[]]{[]<>}>[<{}()>{<>[]}]]]<[<{[][]}(<>[])>[[{}[]]<[][]>]][((()[])[<>{}]){{{}()}[(){}]}]>]>
+{[[[<<{{[<<<([{}[]]<<>[]>)([()]<{}{}>)>({<<>{}>(()[])})>[(((<><>>{<>{}})<<<>[]>[[]()]>)({(()(
+[[[{<<(({{[((<{}<>>[{}])({<>{}}<{}{}>))[(<{}()>(<>{}))(<<><>>{{}{}})]]({{<()>}}(<{(){}](<><>)
+(({{[[[<[{<{[<{}()><<>{}>]}({[[]()]<{}[]>])>}[<{{(<><>)<{}()>}{{{}<>}{{}[]}}}(([<>[]]([][]))
+<[<<{({[(<(<{({}<>)<[][]>}{(()[])({}[])}>{(<{}{}>>})>([<<<<>{}>((){})>[(()())[[]()]]><{[{}<>]<<>
+[{<{[(<[[[{({({}<>)(()<>)}{<[][]>})}{[<[()[]]{[]<>]>{<{}()>(()())}]{[<()()>{<>[]}]<[<><>]>}}]
+({{<{[[[([({{<<>()>(()<>)}(<{}()><()[]>)}<[[{}()]<{}[]>]{((){}){{}[]}}>)[([{<><>}<()<>>][(<><>)(()())]
+(({<{{{[([{<<<{}{}>{[]{}}>([<>[]]{[]{}})>}{<<{[]{}}[[]{}]>{<<>{}>([]())}><(<(){}>({}[]))[(<>[])(()<>)]>
+<[<(<{[[<([({[<>()][<>{}]}{{()()}[<><>]})]<[[<[]()>]<[{}<>]([])>]{<[<>[]]<<>()>]((<>())[<>{}])}>)([{<[[][]]
+<<{{((({<<[[<{<>()}(()())>[(()[])[()<>]]]{({{}[]}[<><>])}]<{<<<><>>{{}[]}>}<[<[][]>[{}[]]](<()()>{[]{}})
+[<<{<{([{(({[{()[]}{()}][({}{})(()[])]}{({<>()})({[]()}({}[]))}))}][[[([[{<>[]}[{}[]]][[<><>]<()[]>]]([
+[([[{{<(<[{(<<()<>>><[[]()]{()()}>)<(({}()){[]<>})>}]>)>{<[<{{((()())({}<>)>{([]{}){{}<>}}}}<({
+((<<{(<[(<[[<({})>[{[][]}[<>[]]]]]>)]>)}([(<[[([(([][]))[{{}()}([][])]][((<><>){[]()})])]]<<(
+<<<<(<{[{[({<{(){}}[<>]>[<[]<>>{<>()}]}[<[<>()]>{[[]<>][{}[]}}])(<{<(){}>[{}{}]}<(()<>)<()[]>>>)][<{{<[]<
+(([[<{[({{{[<<<><>>(()())>({[]<>}(<>()))]{<[<>()][{}{}]>([[]()]((){}))}}((<({}{})[<>]>([<>()]{(){}})))}[<{([<
+{[([<<[([[<[(<[]()>{()[]})<{<>()}{(){}}>]><<{<[][]><{}()>}(<[]<>>([]<>])>>]{[[<<{}<>>({}[]
+{{[<<(<({[<<{<[]<>>}{(<>())}>[{[<>]{(){}}}]>]}{{{<([()<>]{<>{}})(<()[]>[[]()])><[<<>[]>({}{})]((()())[{
+[{{[<{<<{{<[<<()()>[{}]>([{}{}]({}{}))]{(<[][]>([][]))(([]{})<<>[]>)}>}({{<{<>[]}[<>()]>(({
+[<{[(<<[<<(([[<>[]]][([]())({}<>}])){(({[]()}{()<>})[<[]{}>(<><>)])[<[{}[]][{}{}]><{(){}}<{}{}>>]}>({<<[[]()
+[({[<<<({<({({{}<>}[[]{}])}({({}<>)<<>[]>}))([<{(){}}>])>}{<{[[{{}{}}(<>{})]]<[[()[]]<<><>>]{[<><>]<{}()>
+[<{<<<<(([([[{{}()}[<>]][((){})[[]{}]]](({[]()}[[]()])[{[]()}(<>[])])){[{<<><>>{{}<>}}<{()[]}[[]
+[{({<(((<({{({[]()}))[((()())<[][]>)<{<>{}}(<><>)>]}{[<[[][]](<><>)>][[{<>{}}[<>{}]](<<>[]>{[][]})]})>)))>}
+[[{[[{({[([(<<<>[]>[<><>]>([{}()][<>()]))<<[<>{}]{{}<>}>[<<>{}>([]{}]]>])<(<(<[]()>)[(()[])
+<([(<<[<<({{{([]{})}[{()<>}<[]()>]}}{(<{[]{}}([][])>)})[[[<[[][]]<<><>>><{{}{}}(<><>)>]<<(()())[(){}]>{
+[(<{[{({[({<{<{}[]><<>()>}{<{}()>[[][]]}><<{{}()}{(){}}>>}[<{{<>{}}{()())}>]){[<[{()()}<[]()>]><[[{
+<{<[{([([<<[<[<>()]{(){}}>][({{}[]}((){}))[<[][]><()<>>]]>>{{{<{<><>}{(){}}>({<><>}<()))}({<()><{}[]>}(<(
+({((([[{([<[(([]{})){[()<>][<><>]}]>{[<<{}{}><()[]>>(<<>>)]({<<><>>[<>{}]}{<[]{}><<>{}>})}])[(<(([<><>][{}{
+<[<(([(({([[<(()[])[[]{}]>{<<>{}>(<>{})}]]([([<>{}]{[]{}})][{<()>{()[]}}(({}[])(<>[]))]))})({{[(({(){}}[<>
\ No newline at end of file
diff --git a/src/10.cs b/src/10.cs
new file mode 100644
index 0000000..be24b9b
--- /dev/null
+++ b/src/10.cs
@@ -0,0 +1,160 @@
+namespace aoc2021
+{
+    internal class Day10
+    {
+        internal static void Go()
+        {
+            Logger.Log("Day 10");
+            Logger.Log("-----");
+            var lines = File.ReadAllLines("inputs/10.txt");
+            Part1(lines);
+            Part2(lines);
+            Logger.Log("");
+        }
+
+        private static void Part1(IEnumerable<string> lines)
+        {
+            Dictionary<char, int> charVals = new()
+            {
+                { ')', 3 },
+                { ']', 57 },
+                { '}', 1197 },
+                { '>', 25137 },
+            };
+
+            using var t = new Timer();
+
+            long score = 0;
+            foreach (var line in lines)
+            {
+                var (corrupted, ch) = IsCorrupted(line);
+                if (corrupted)
+                {
+                    score += charVals[ch];
+                }
+            }
+
+            Logger.Log($"part1: {score}");
+        }
+
+        private static (bool, char) IsCorrupted(string line)
+        {
+            var s = new Stack<char>();
+            foreach (var ch in line)
+            {
+                switch (ch)
+                {
+                    case '(':
+                    case '[':
+                    case '{':
+                    case '<':
+                        s.Push(ch);
+                        break;
+
+                    case ')':
+                    case ']':
+                    case '}':
+                    case '>':
+                        var popped = s.Pop();
+                        if (ch == ')' && popped != '('
+                            || ch == ']' && popped != '['
+                            || ch == '}' && popped != '{'
+                            || ch == '>' && popped != '<')
+                        {
+                            return (true, ch);
+                        }
+                        break;
+
+                    default:
+                        throw new Exception();
+                }
+            }
+
+            return (false, '\0');
+        }
+
+        private static void Part2(IEnumerable<string> lines)
+        {
+            Dictionary<char, int> charVals = new()
+            {
+                { '(', 1 },
+                { '[', 2 },
+                { '{', 3 },
+                { '<', 4 },
+            };
+
+            using var t = new Timer();
+
+            List<long> scores = new();
+            foreach (var line in lines)
+            {
+                var (corrupted, _) = IsCorrupted(line);
+                if (corrupted)
+                {
+                    continue;
+                }
+
+                var s = new Stack<char>();
+                foreach (var ch in line)
+                {
+                    switch (ch)
+                    {
+                        case '(':
+                        case '[':
+                        case '{':
+                        case '<':
+                            s.Push(ch);
+                            break;
+
+                        case ')':
+                        case ']':
+                        case '}':
+                        case '>':
+                            s.Pop();
+                            break;
+
+                        default:
+                            throw new Exception();
+                    }
+                }
+
+                long score = 0;
+                while (s.Count > 0)
+                {
+                    var ch = s.Pop();
+                    if (ch == '(')
+                    {
+                        score *= 5;
+                        score += charVals[ch];
+                    }
+                    else if (ch == '[')
+                    {
+                        score *= 5;
+                        score += charVals[ch];
+                    }
+                    else if (ch == '{')
+                    {
+                        score *= 5;
+                        score += charVals[ch];
+                    }
+                    else if (ch == '<')
+                    {
+                        score *= 5;
+                        score += charVals[ch];
+                    }
+                }
+
+                scores.Add(score);
+            }
+
+            if (scores.Count % 2 == 0)
+            {
+                throw new Exception();
+            }
+
+            var final = scores.OrderBy(x => x).Skip((int)Math.Floor(scores.Count / 2.0)).First();
+
+            Logger.Log($"part2: {final}");
+        }
+    }
+}
diff --git a/src/main.cs b/src/main.cs
index 52581f4..b7ae956 100644
--- a/src/main.cs
+++ b/src/main.cs
@@ -4,4 +4,5 @@
 //aoc2021.Day06.Go();
 //aoc2021.Day07.Go();
 //aoc2021.Day08.Go();
-aoc2021.Day09.Go();
+//aoc2021.Day09.Go();
+aoc2021.Day10.Go();