diff --git a/build.gradle.kts b/build.gradle.kts
index a778363..367a8dc 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,6 +12,7 @@ repositories {
 }
 
 dependencies {
+    implementation("com.github.h0tk3y.betterParse:better-parse:0.4.4")
     testImplementation(kotlin("test"))
 }
 
diff --git a/src/main/kotlin/me/gergo/Aoc13.kt b/src/main/kotlin/me/gergo/Aoc13.kt
new file mode 100644
index 0000000..fbd4983
--- /dev/null
+++ b/src/main/kotlin/me/gergo/Aoc13.kt
@@ -0,0 +1,83 @@
+package me.gergo
+
+import com.github.h0tk3y.betterParse.combinators.*
+import com.github.h0tk3y.betterParse.grammar.Grammar
+import com.github.h0tk3y.betterParse.grammar.parseToEnd
+import com.github.h0tk3y.betterParse.grammar.parser
+import com.github.h0tk3y.betterParse.lexer.literalToken
+import com.github.h0tk3y.betterParse.lexer.regexToken
+import com.github.h0tk3y.betterParse.parser.Parser
+import java.io.File
+
+fun main() {
+    val packetPairs = File("src/main/resources/input13.txt").readText().split("\n\n")
+        .map(::parsePacketPair)
+
+    // Part One
+    val result1 = packetPairs
+        .mapIndexed { i, p -> if (p.first < p.second) i + 1 else 0 }
+        .sum()
+    println("Sum of packet indices in right order: $result1")
+
+    // Part Two
+    val divider1 = Packet(listOf(listOf(2)))
+    val divider2 = Packet(listOf(listOf(6)))
+    val result2 = File("src/main/resources/input13.txt").readLines()
+        .asSequence()
+        .filter { it.isNotBlank() }
+        .map(::parsePacket)
+        .plus(divider1)
+        .plus(divider2)
+        .sorted()
+        .mapIndexed { i, p -> if (p == divider1 || p == divider2) i + 1 else 0 }
+        .filter { it != 0 }
+        .reduce(Int::times)
+    println("Decoder key: $result2")
+}
+
+private data class Packet(val value: List<Any>) : Comparable<Packet> {
+    override fun compareTo(other: Packet) = compareLists(value, other.value)
+}
+
+private fun compareLists(a: List<*>, b: List<*>): Int {
+    for (i in a.indices) {
+        if (i == b.size) return 1 // Right side ran out of items => left is "larger"
+        val cmp = compareValues(a[i], b[i])
+        if (cmp != 0) return cmp // One of the items was larger or smaller
+    }
+    if (a.size < b.size) return -1 // Left side ran out of items => right is "larger"
+    return 0 // Equally large and items were equal, too
+}
+
+private fun compareValues(a: Any?, b: Any?): Int {
+    return if (a is Int && b is Int) {
+        a.compareTo(b)
+    } else if (a is List<*> && b is List<*>) {
+        compareLists(a, b)
+    } else if (a is Int) {
+        compareLists(listOf(a), b as List<*>)
+    } else {
+        compareLists(a as List<*>, listOf(b))
+    }
+}
+
+private fun parsePacketPair(packets: String): Pair<Packet, Packet> {
+    val (p1, p2) = packets.split("\n")
+    return Pair(parsePacket(p1), parsePacket(p2))
+}
+
+private fun parsePacket(line: String) = packetGrammar.parseToEnd(line)
+
+private val packetGrammar = object : Grammar<Packet>() {
+    val comma by literalToken(",")
+    val openingBracket by literalToken("[")
+    val closingBracket by literalToken("]")
+    val integer by regexToken("\\d+")
+    val whiteSpace by regexToken("\\s+", true)
+
+    val integerParser = integer map { it.text.toInt() }
+    val listParser = (-openingBracket and separated(parser(this::value), comma, true) and -closingBracket)
+        .map { it.terms }
+    val value: Parser<Any> = integerParser or listParser
+    override val rootParser = listParser map ::Packet
+}
diff --git a/src/main/resources/input13.txt b/src/main/resources/input13.txt
new file mode 100644
index 0000000..926d2f2
--- /dev/null
+++ b/src/main/resources/input13.txt
@@ -0,0 +1,449 @@
+[[],[1],[[[1,3],2,1,3]]]
+[[[],6,[3,8]],[]]
+
+[[9,6,0],[[0]],[[[5,3,1,1,10],4,[],[10,2],[2,9,9,7]],[[10],8]],[1,[[4,9,10,0]],[[0,8],10,8],0],[[7,[5,6,5,7],9,4,[0,4]]]]
+[[9,[],[10,4],[2,9,[2]]],[[[],6,3],1,7,[5,0],[7,7,[10],[0,6,2,4,7],7]]]
+
+[[[],[],[]],[6,[[1,4,7,9],7],[]]]
+[[],[],[],[[[6,2,1],[5,7],2,[8,0],[7,1,5,6]]]]
+
+[[5,1],[3],[4,6]]
+[[3,3,[1,[2,4,2,7,2],[0,3],8],9,0],[4,[6]],[],[9,[2,[9,9,2,6,7],[],2,2],[[],[10],[],[0]],6]]
+
+[[[10,[10,3,5],1,8],[[10,4],2,10,0,6],[3,3,2,[4,4],[3,6]]],[[[],2,0,8,[2,2,3,3]]],[[8],3,10,4,4],[]]
+[[1,[7,10],[[2],[10,2,1,4,2],[2,3,8],0,8],5],[7,[[10,4],8]],[],[],[]]
+
+[[[4,[2,2,8,0]],3,5,[0],3],[4,[10],10,1],[3],[1],[1,4,[10],[[8],[5,3,0,6,6]],8]]
+[[2,4],[3,1,[],[[]],[4,[7,0,3],0]],[]]
+
+[[2,0],[[],[[3,0,6],6,2,6],8,5,[0,[10,0,10,10,8],[4,5,1]]],[[[6,7,0,6,10],[8],[1],6,7],0,6,[10,5,4,[4,2,9],0],[[2,7,8,6,7]]],[[[7,8,6,3],0,[4,3,3,10,8],[4]],[8],2,1,[1,7,[2,3,6],[7,3],9]]]
+[[6],[5],[],[6,0],[[],[9,[10,5],10,[4,3,0,6,6]]]]
+
+[10,0,2,0]
+[10,0,2,0,2]
+
+[[9],[4],[1,[[7],[8,3,4,6,5],[7,7,9],[10,9,1],[7]],[[3,9,9],[],[],6,[1,2]]],[],[3]]
+[[4],[3,9,[[9,10,8,2,7],9,[10,9],3,[7]]],[[6],[9,[9,10,3],[],0],[],[8],9],[7,1]]
+
+[[0,[[2,7,1,9],6,[4],[3,4,10]],[2,4,9,[3,8],7]],[4,[3]]]
+[[[[2,3,5,2,7],[10],[10,2,7],4,0],[10,[8,10,2,1,2],[7]],3,[10,[7,3,10,3]]],[],[6,3,[[0]]],[0,[0,[],6,4],3,[[9,5]]],[9,6,7,8,3]]
+
+[[[],1],[2,1,[],8,[]],[8]]
+[[4],[8,[9],[[5,3,1,3,9],[6,0,0],10,8,5],6],[]]
+
+[[1,[[7,6,3,4],9,[]]],[6],[],[[10],[3,[7,9],[8,0,1,6,7],3,[7,8,4,5]],3],[[4,[8,1,0,7],6]]]
+[[[1]],[4,5,2,[0]]]
+
+[[9,[0,[1,10,9,8]]],[[3]]]
+[[],[[[],[5,3,3],[]]]]
+
+[[0]]
+[[],[[0,4,[],[10]]],[6,[[1,4,8]],3,[5,[10,3,7,5],7,[7,2,3,4]],8],[]]
+
+[[[9,[6,1,5,6,6]],[[6,5,9],9,2,[2,10,0,4]],2,7,[1,[],[5,5,6,3,10],[1,5,3,6]]]]
+[[4],[],[],[[[]],[3,[8,3,3,2],0],[6,[8],1,[6,4],[5,0]]],[10,6]]
+
+[[4]]
+[[],[3,[[4,1,3,7],5,[],[10,4,0,8]],[],8,9],[9,[[6,3,2,7,0],1,[],[6,4],6],6,[4,9,1,[3,0,6,4,5]],1],[9,[5,3,7],[[1,8,10,7],[5,3,5],[6],0]],[1]]
+
+[[5,[2,[6,1,4,2]],[[6,6,2],[10,3,10,10],[5,8,10],10],[0,3,[2,4,2,1]],5],[[[1,9],10,[]],[9,[1,9,3],8,7,[]],[[1],[],3,[5,2],10],[[1,2,1],3]],[3],[[],10,0,[]]]
+[[],[[5],[9,9,4]],[[5,[10,10],[0,9,6,3,7],2,5]],[8],[1,7,8]]
+
+[[],[8,6],[0,8,[[7,0,2]]],[0,0,[9,[9]]],[]]
+[[[1,[10,8,0,0],0],[]],[],[],[[7,[4,7,10,9],[]],[7,4,[],2,[3]]],[]]
+
+[[5,4,[]]]
+[[0,1,9,9],[6],[[[4],[7,1,7,10],[5,2,7]],[1,8,6]],[[[8],[6],1,[3,8]],10],[]]
+
+[[1,9,[5,5,[0,5,0],[0,7,1,3,1]],3],[7,[],1,[4,7,6]],[[2,2,2,7,[8]],[[9],[5,9,5,2],6,7],[[7,3,10,1],2,0,[1,3],5],6,6]]
+[[],[[[5,2],3,[],1,10],1,9,[3,6,4,[],[4,1,2,7]]],[],[[[9,9,10,2,5],[3]],[8,1,[6,0]]],[[],[],[2,[5,2,6,6],[4,9,6,3,9],2],6]]
+
+[[[[],3,7,5],[3,[4,9,0],[]],[[6,7,7,7,10],[0,6,7,4,8],5,7,[1,10,8,10]],1,1],[[4,5,10,[10,1]],9,[[6,1,0,6]],9],[3],[],[0]]
+[[10,0,[[5,4,2,3]],4],[6,[],4,[8,8,[3,7,10,7],7,4],2],[4,7,[],[[3,5,6],2],10]]
+
+[[[[7,9],[7]],[3,10],[]]]
+[[[[4,2],[0,9]],[2,0],4,4]]
+
+[[[9,[6,1],5,[5,10,0]]],[[[4,7,5,8,0],7,[2,2,3,0,4],[8,5,3,2,8]]],[3,[],[5,[3],9,[10,5,6]]],[[0],9,[2,[10,9,4,7],[7,4,0],[1]],4,1]]
+[[[0,10]],[3,8,1,[10,[6,7,8],[],[10,6,7,6,9]],[10,5]],[6,7,[5]],[[[],7],2,3,[3]],[2,6]]
+
+[[[2,3,7,9]],[[[],[6],[],[9,1,0,0,10],10],1,7],[7,[[2,5,0,5],2,[9,9,1,2,3],[],9],7]]
+[[[[3,0]],2,[[2,8,0,8],1,[0,3],[7,10,5,9,2],[10,5,4,5]]],[3,8,7,3],[5,[7,5],[2,3,10,[9,6,9],[7]],3,3],[0,[5,[7],[],6,[0,7,2,5]],4,[[5,6,9,9,3],[1,7,5,5,1],[7,4,3,8,5],[6,10,4,10,10],8]]]
+
+[[[9,[2,4,3]],6],[4,9],[8]]
+[[10,[],7],[10],[[[1,6],[4,0],9,8],[[6,1,5,6],2],10,5],[],[[8,[8,5],[1,6,6,4,10]],5,8,6]]
+
+[[],[4,[4,[6,10,0],[10,8,10,10,2],[6,0]]],[[[5]]],[6]]
+[[[10,[5,9,6]]]]
+
+[[[],[4],[[5,6,7,7],[4,3,7],[2,1],[]],1]]
+[[[8,8],2,[],[],[[7,3,2],6,5,[6]]],[2,[5,7,[3,5],9],8],[1,[10,[0,6],[10,7],1,[9,3,4]],5],[]]
+
+[[]]
+[[9,8]]
+
+[[8,3],[[],2,[[]],[2,5,9,1]],[[[7,9,9,4,1],[10,3],3,[3]],[1,10,3]]]
+[[8,[2,3,7,9,[]],[],7],[]]
+
+[[[[4],[],6,9,[3,6,8]],[1,[0,6,7],[3,0]],5,[[6],[5,6,2,2],[8,10],1,2],[[3,8,7,10,10],4,8]],[1,[[4,8,2,7],3,[2],[],5]]]
+[[[[3,6,4,8],[10,7,2,9],[4,6,5,9,1]]],[[4,7,4,[1,3],8],[[6,10],[5,0,3,0],5]],[[[3,9],[6,2,10,5,1],[4]]]]
+
+[[[[10,6],9,[5,1,9],[0,3,4,6],[6,1,8]],2],[5],[9]]
+[[0,6,10,2],[[6,8,3,2,[9,8]]]]
+
+[[7],[],[],[[],[[10,0,3,3,1],0],[10],[5,[9],0,6,2],5],[[3,6,6,9,[8]],0,[4,9,[0,5],[]],[[7]],[[8,1,8,4],[2,6,6,3,4],[9,4,2,3],[],[10,4,5,7,2]]]]
+[[4],[6,[],[2,9],7],[2]]
+
+[[[],0,[[2,6,8,0,9],6,[10,4],2,[]]]]
+[[[0,[],[3],10],10,[6,[10,9,9,6],5,[0,2,4,3],[4,3]],5],[3,[5,0],7,2,[4,[5],[3,4,8],[3,5,4,9,6],5]],[[[2,10,0]],[[10,3,2],[7,3],[2,4,2,6],[5]]]]
+
+[[[[6,3],4]],[[],[],[[5,8,0,5,8],7,0,0],[[],6,5,10]]]
+[[],[10,[10,[1]],7,[[8],[6,7,7],3,4,8]]]
+
+[[],[[1,5,[9,7,8,3,9],9,[1,3,5,10,8]],6,10,[[5,6,3,0,8],9,1],4],[],[[[2,1],[3,10,1,7]],[9,[6]],2,4,4]]
+[[],[[8,1,5,[6,1,7],[8,1,1,0]],5,1]]
+
+[[7,5,6,3,1],[[1],10],[[]],[[],2],[[[8],10,3,[8,3,1,9],6],0,[0,[0,2,1,0],0,[9,4,6]]]]
+[[1,2,8,8],[5,[6,[1],[6],[],[3,1,8,6,0]],[]],[[[5,6],3],6,[]]]
+
+[[],[[[2,4,6,0,0],6],4],[[7,[2,1]],[5],4],[2,[],[0]],[6,[[9,7]]]]
+[[6,7,4],[],[],[[[8,9,4],[1,7,3],[6,2],7,8],[5,[6,5,3]],[3,6]],[]]
+
+[10,2,2,7,5]
+[10,2,2,7]
+
+[[9]]
+[[[6,5],0,[[],[],[6,9,6,2,6]]],[7,3,[],8,[8,3,[0,3,3,8],[5,6,9],[1,1,9,3,1]]]]
+
+[[4,0],[1,[[7],[],[8,7],[7],10]]]
+[[[]],[[[6,2,1,7,2],[7],2],8,[[6],5,6],1],[6,[0,10,6]]]
+
+[[[8,4],[3],2],[[[],[7],5],[4]],[9,1,5,5],[8,1,[[],7],1,[]],[[10,[],3,[7,2,6,3]],[],[[1,2,10,7,0],[],1],7,[3,[1,4,1]]]]
+[[4,5],[[],[],[8,[5,8,5,5],[]]],[[],8,4,10],[]]
+
+[[[[1,2,1,9],[3,8,4,2,9],[10,0],[2,1,0,10],[2,1,2,9]],[0,3,8],2,6],[[9,[],[]],[[],[],[2],5,[10,2,7,1]],[[6,9,2,8,2],0,10],[[0,0,10],5]],[1,[[6],1]],[[1],5],[9,[[1,6,8]]]]
+[[[[10,4,9,9],[],0,5]],[9,[6,9,6],10,9,6],[],[[3,8]],[[1,5],[[]],[]]]
+
+[[0,[10,[2]],10,9],[10,0],[[],8,4,3,[[9],6]],[[4,10],4,[],2]]
+[[4,[],8,7,5],[6,[3,[4,4,1,6,5],6,2,8]]]
+
+[[],[8,[[0,7,2],[7,1,0,2],[],[1],9],3],[10],[[3],0]]
+[[],[7,3],[[]]]
+
+[[1,[0,[],[8,8,4],[2,8,3,10],4],8,[[6,1],[0,9,3,1,4],[8],2]],[3,9,[2,[],[7,3],5]]]
+[[[7],1,[[0,7],7]],[6,7,7],[],[]]
+
+[[[[5,1]],[3,5,0]]]
+[[],[0,[1],[[7,4],10],10],[0,8,[[3],2],[[6,7,5,10,2],[9,6,8,9],8]],[7,2,[1,[6,5],[],[4],[5,4,8,0,10]],[8]]]
+
+[[4,[8,10],6]]
+[[1,[7,10,4,6,[6,1]],7,[[3,8,1,6],[7,2,0],[]]]]
+
+[[10,[0]],[[],[10],10,7],[1,[]],[0,[5],[10],8,[2,0,1,[3,5,2,3,1],4]]]
+[[1,5,4],[[[2,6]],5,[0,[],[2,5,4,10],[9,7,0]],10],[]]
+
+[[],[[[6,6,1,0,3],[5]]],[2,[[1,7,7,4,3],0,1],[[1,10,6],[1,7,9]],7,[[5,9,4],[5,10,2],[6,5],[3,6]]],[[4,[3,10]],[],[[10,4,6,1],[9,0,2],1,[4],[8]],[[9]],10]]
+[]
+
+[[4,4,6,[1,[2,10],6,[7]],[7,6]],[4,0,[0,3],6,8],[],[9,[3,0,[3,5],1],9,2,6]]
+[[4,[[7],4]]]
+
+[[[[8,6,1]],2],[[1,10,[5]],[[],[4,3,9,7],[3,8,9],2],7,10],[4,[[],[10,6,9,4],[],5,2],[3,4,1,[3,9,10,4,6]],0,[10]],[[10],[4,3,3,9],[],[]]]
+[[6,[[2,2,8,6],[10,3,5],1]],[7],[[3,[4,1,2],2,10,[3]],5],[[8,[2,1,2,3],7],[5,[6],[0,3,9],[2,2]]],[[5],[9,2],9]]
+
+[[],[[[],[3,1,1],8],[2,0,3]],[[[1],[4]],3,9,5,[5,10,4,9]],[[[5,3,4],[4,3,10,9,8],0,8,[8,4,10]],10,2,[3,7]],[[],1]]
+[[[]],[4,[[6,8,3,2,10]],[[7,2,0],3,[1,3,10,10,9],[1,8,0,0],6],[10,[0],[3,4],[9],0]]]
+
+[[],[[[7,5,5,7,3]],[[4,4],10,[6,8,6,8],4,[9]]],[[],0]]
+[[2,[]],[[],[],2,[],[]]]
+
+[[[],0,2,[]],[9,[[],6,3]],[[[6,0,1,4],7,5,6,[7,8,1,6,0]],10,2,6,4],[[],5,1]]
+[[],[6,3,9,[[4,7,0,3],7,[5,9,7,10],6]],[[[1,0,0,1],[7],3,[10,6,5,9,0]],[5],9,0,3],[7,[[5,7,8,3],3,[1,4,4,1],[6,2,7],9]]]
+
+[[6,6,10,6,0]]
+[[[7,[3,7,6,10,1]],[[1,4,9,9],10,4],3],[0,[]],[1,9,[[4,8],[],5]],[],[]]
+
+[[[[1,3],[10,7,9],[0,6],[0,7],[4]],[[3,0],2,[4,2,8]],7],[0],[],[]]
+[[1,10,9,9]]
+
+[[1],[],[9,4,10]]
+[[[[9,7],[2,0,8,6,5],0,8],[[0]],10,[6,[],6],3]]
+
+[[4,[],[[3,2,1,4],1,[5,10,0],[6,10,5],[1,1,6,10,6]],8],[[1,[5,0,1,8]],[[],[3,8,6,8],[1],[0,4]],10],[2,[[],[],[2,3],0,[5,9,2,6,9]],2,7,3],[],[5,0,[8,[0,7,4,7]],[9,5,10,4],5]]
+[[[[4,6,5],[9,3,7,10],[1,9,8,6,2],[1],[9,9,4,2]],[[8],[0,6,5],[6,9,10,8],8]],[3,[[0,9]]],[1,5,[[0,4],[9,6]],2,9]]
+
+[[7],[],[[4],7]]
+[[[9],0],[[3,[6,1,8,8],[4,7,3,0]],[[6,4,0],10,4,3,9],10,6,1],[[6,[2,8,6,3,1],[]]],[7,[[1,0,1],2,0,[10],[10,3,5,7,1]]],[7,7]]
+
+[[9,[[6],[3,0,4,2],0,0,9],2],[[[8,4,0]],[[0,8,9],9,4,6]],[],[6,[[6,6,9,8]],[[5]]]]
+[[[3,1,[5,5,7,6,6]],7,[3,10,[8]]],[1,8,[9,[2,10,6,7,2]]],[[4,2,3],5,10,1,9],[4,0,[],6],[[1,[5,8,8],8,1,3],[[2]],9,[7]]]
+
+[[[],9,[],8],[[],[[8,4,6,3,8]],5,[]],[1,[7,10,[7,10,6,7]],[]],[9,[[],3],[0,5,0,[1,10,5,2,4],8]]]
+[[8,2,6,0],[7]]
+
+[[10,[[],6,9,0]],[6,[7,[10],0,3],5],[[[7,2,1,9],[1,2,7,0],[9,1,8],[],6],3,[[3,5,0,8,8],6,[10,8]]],[[[8,4,1,6],2],[[7],10]]]
+[[[[1,8,5,4],7,[5,3],5,[7,5,5,7,10]],[[],5,5],[]],[]]
+
+[[2],[0],[[10,[1,1,2],[],4],[[10,2,4,5],0,[]],[[10]],[[9,7,1,0,4],[9],1,[3,0,3,1]],[]],[],[6,1,1]]
+[[],[[10,[3,3,4,5],1,[9,10,7,8,1],4],[[7,3,10,10,8],1],[[6,10,2,8],[5,10,6],3,2],2],[[0],[[],4],3],[],[[[8,3],[0,1,5,2],4,[2,1,7,10],6],[[0],[8],0,3],8,[[4],[],7,9,[7,4,4]]]]
+
+[[[7,[],7],[[]],[8,6,8],5,7],[1,5]]
+[[9,[[6,3,3,6]],4,[5],6],[3,[],[]],[[3]],[6,5,[[0,5,2]],6,[9,6,1,7,7]],[[1,7,[9,6],4,0],1,[[8,1,0,8]]]]
+
+[[8,0],[[[10],[10,10,6,3,7],[9,6,8,8]],3]]
+[[3,[3,9],6],[],[],[[7,7,5,4,[7,10,0]]]]
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