diff --git a/day23/input.txt b/day23/input.txt
new file mode 100644
index 0000000..336cd3e
--- /dev/null
+++ b/day23/input.txt
@@ -0,0 +1,26 @@
+cpy a b
+dec b
+cpy a d
+cpy 0 a
+cpy b c
+inc a
+dec c
+jnz c -2
+dec d
+jnz d -5
+dec b
+cpy b c
+cpy c d
+dec d
+inc c
+jnz d -2
+tgl c
+cpy -16 c
+jnz 1 c
+cpy 73 c
+jnz 82 d
+inc a
+inc d
+jnz d -2
+inc c
+jnz c -5
diff --git a/day23/part1.js b/day23/part1.js
new file mode 100644
index 0000000..71560e4
--- /dev/null
+++ b/day23/part1.js
@@ -0,0 +1,77 @@
+var instructions = [];
+var registers = {a: 7, b: 0, c: 0, d: 0};
+
+var instructionSet = {};
+
+instructionSet.cpy = (a, b)=>{
+  if(b in registers){
+    if(Number.isInteger(parseInt(a))){
+      registers[b] = parseInt(a);
+    }
+    else{
+      registers[b] = registers[a];
+    }
+  }
+}
+
+instructionSet.inc = (a)=>{
+  if(a in registers){
+    registers[a]++;
+  }
+}
+
+instructionSet.dec = (a)=>{
+  if(a in registers){
+    registers[a]--;
+  }
+}
+
+instructionSet.jnz = (a, b)=>{
+  b = (Number.isInteger(parseInt(b))) ? parseInt(b) : registers[b];
+  if((registers[a] != 0) || ((parseInt(a) != 0) && (!isNaN(parseInt(a))))){
+    pc = pc + (parseInt(b) - 1);
+  }
+}
+
+instructionSet.tgl = (a)=>{
+  a = (Number.isInteger(parseInt(a))) ? parseInt(a) : registers[a];
+  if((pc+a) < instructions.length){
+    if(instructions[pc+a][1].length == 2){
+      instructions[pc+a][0] = (instructions[pc+a][0] == "jnz") ? "cpy" : "jnz";
+    }
+    else{
+      instructions[pc+a][0] = (instructions[pc+a][0] == "inc") ? "dec" : "inc";
+    }
+  }
+}
+
+var input = require("fs").readFileSync("input.txt").toString().replace(/\r/g, "");
+var instructions = input.split("\n").filter((a)=>(a)).map((instruction)=>{
+  if(instruction.indexOf("cpy") > -1){
+    var instructionParts = instruction.match("cpy ([^ ]+) ([^ ]+)");
+    return ["cpy", [instructionParts[1], instructionParts[2]]];
+  }
+  if(instruction.indexOf("inc") > -1){
+    var instructionParts = instruction.match("inc ([^ ]+)");
+    return ["inc", [instructionParts[1]]];
+  }
+  if(instruction.indexOf("dec") > -1){
+    var instructionParts = instruction.match("dec ([^ ]+)");
+    return ["dec", [instructionParts[1]]];
+  }
+  if(instruction.indexOf("jnz") > -1){
+    var instructionParts = instruction.match("jnz ([^ ]+) ([^ ]+)");
+    return ["jnz", [instructionParts[1], instructionParts[2]]];
+  }
+  if(instruction.indexOf("tgl") > -1){
+    var instructionParts = instruction.match("tgl ([^ ]+)");
+    return ["tgl", [instructionParts[1]]];
+  }
+});
+
+var pc = 0;
+while(pc < instructions.length){
+  instructionSet[instructions[pc][0]].apply(null, instructions[pc][1]);
+  pc++;
+}
+console.log(registers);
diff --git a/day23/part2.js b/day23/part2.js
new file mode 100644
index 0000000..7e049ff
--- /dev/null
+++ b/day23/part2.js
@@ -0,0 +1,77 @@
+var instructions = [];
+var registers = {a: 12, b: 0, c: 0, d: 0};
+
+var instructionSet = {};
+
+instructionSet.cpy = (a, b)=>{
+  if(b in registers){
+    if(Number.isInteger(parseInt(a))){
+      registers[b] = parseInt(a);
+    }
+    else{
+      registers[b] = registers[a];
+    }
+  }
+}
+
+instructionSet.inc = (a)=>{
+  if(a in registers){
+    registers[a]++;
+  }
+}
+
+instructionSet.dec = (a)=>{
+  if(a in registers){
+    registers[a]--;
+  }
+}
+
+instructionSet.jnz = (a, b)=>{
+  b = (Number.isInteger(parseInt(b))) ? parseInt(b) : registers[b];
+  if((registers[a] != 0) || ((parseInt(a) != 0) && (!isNaN(parseInt(a))))){
+    pc = pc + (parseInt(b) - 1);
+  }
+}
+
+instructionSet.tgl = (a)=>{
+  a = (Number.isInteger(parseInt(a))) ? parseInt(a) : registers[a];
+  if((pc+a) < instructions.length){
+    if(instructions[pc+a][1].length == 2){
+      instructions[pc+a][0] = (instructions[pc+a][0] == "jnz") ? "cpy" : "jnz";
+    }
+    else{
+      instructions[pc+a][0] = (instructions[pc+a][0] == "inc") ? "dec" : "inc";
+    }
+  }
+}
+
+var input = require("fs").readFileSync("input.txt").toString().replace(/\r/g, "");
+var instructions = input.split("\n").filter((a)=>(a)).map((instruction)=>{
+  if(instruction.indexOf("cpy") > -1){
+    var instructionParts = instruction.match("cpy ([^ ]+) ([^ ]+)");
+    return ["cpy", [instructionParts[1], instructionParts[2]]];
+  }
+  if(instruction.indexOf("inc") > -1){
+    var instructionParts = instruction.match("inc ([^ ]+)");
+    return ["inc", [instructionParts[1]]];
+  }
+  if(instruction.indexOf("dec") > -1){
+    var instructionParts = instruction.match("dec ([^ ]+)");
+    return ["dec", [instructionParts[1]]];
+  }
+  if(instruction.indexOf("jnz") > -1){
+    var instructionParts = instruction.match("jnz ([^ ]+) ([^ ]+)");
+    return ["jnz", [instructionParts[1], instructionParts[2]]];
+  }
+  if(instruction.indexOf("tgl") > -1){
+    var instructionParts = instruction.match("tgl ([^ ]+)");
+    return ["tgl", [instructionParts[1]]];
+  }
+});
+
+var pc = 0;
+while(pc < instructions.length){
+  instructionSet[instructions[pc][0]].apply(null, instructions[pc][1]);
+  pc++;
+}
+console.log(registers);