diff --git a/AdventOfCode2018/1stDay/challenge2/challenge.txt b/AdventOfCode2018/1stDay/challenge2/challenge.txt
new file mode 100644
index 0000000..a19d994
--- /dev/null
+++ b/AdventOfCode2018/1stDay/challenge2/challenge.txt
@@ -0,0 +1,21 @@
+--- Part Two ---
+You notice that the device repeats the same frequency change list over and over. To calibrate the device, you need to find the first frequency it reaches twice.
+
+For example, using the same list of changes above, the device would loop as follows:
+
+Current frequency  0, change of +1; resulting frequency  1.
+Current frequency  1, change of -2; resulting frequency -1.
+Current frequency -1, change of +3; resulting frequency  2.
+Current frequency  2, change of +1; resulting frequency  3.
+(At this point, the device continues from the start of the list.)
+Current frequency  3, change of +1; resulting frequency  4.
+Current frequency  4, change of -2; resulting frequency  2, which has already been seen.
+In this example, the first frequency reached twice is 2. Note that your device might need to repeat its list of frequency changes many times before a duplicate frequency is found, and that duplicates might be found while in the middle of processing the list.
+
+Here are other examples:
+
++1, -1 first reaches 0 twice.
++3, +3, +4, -2, -4 first reaches 10 twice.
+-6, +3, +8, +5, -6 first reaches 5 twice.
++7, +7, -2, -7, -4 first reaches 14 twice.
+What is the first frequency your device reaches twice?
\ No newline at end of file
diff --git a/AdventOfCode2018/1stDay/challenge2/index.js b/AdventOfCode2018/1stDay/challenge2/index.js
new file mode 100644
index 0000000..76b25d3
--- /dev/null
+++ b/AdventOfCode2018/1stDay/challenge2/index.js
@@ -0,0 +1,24 @@
+const fs = require('fs');
+let input = fs.readFileSync('input.txt')
+                .toString()
+                .split('\n')
+                .map((x) => parseInt(x));
+
+let seenFrequencies = new Set([0]);
+let total = 0;
+let i = 0;
+
+while (true) {
+    if (i === input.length) {
+        i = 0;
+        continue;
+    }
+    total += input[i];
+    if (seenFrequencies.has(total)) {
+        break;
+    }
+    seenFrequencies.add(total);
+    i++;
+}
+
+console.log(total)
diff --git a/AdventOfCode2018/1stDay/challenge2/input.txt b/AdventOfCode2018/1stDay/challenge2/input.txt
new file mode 100644
index 0000000..0d7449e
--- /dev/null
+++ b/AdventOfCode2018/1stDay/challenge2/input.txt
@@ -0,0 +1,1008 @@
++15
+-7
++16
++5
++12
++16
+-4
++10
+-1
++14
+-16
++6
++4
++11
+-2
++5
++4
++12
++13
++5
++16
++18
+-3
+-2
++9
+-10
++12
+-10
+-17
++12
+-14
+-14
++11
++1
+-16
++11
+-5
++20
+-1
++14
+-15
+-10
+-5
++4
+-17
+-13
+-2
+-12
+-15
++12
++8
+-3
++13
++17
++21
++21
++8
++9
+-5
+-15
+-19
+-9
+-17
+-5
++15
++12
++14
++19
+-2
++15
+-6
++19
+-2
++4
+-5
+-8
+-4
++10
++1
+-5
++10
++12
++14
+-2
++11
+-3
+-15
+-6
++14
++3
++8
++10
++14
++11
++18
++3
+-4
+-5
+-13
++17
+-12
+-8
+-5
++7
++7
+-10
+-19
++17
++1
++17
+-5
+-9
+-10
+-9
+-1
+-3
+-14
++11
++1
++11
++1
++2
+-17
++4
++19
++17
++6
++18
+-4
++3
+-13
++7
+-3
++19
++5
++2
++6
++12
++5
+-7
++10
++16
+-9
+-16
++11
++10
++2
++7
+-16
++6
++16
++17
++11
++11
+-14
++11
+-16
+-13
++6
++8
++10
+-4
+-5
++2
++5
+-18
++19
+-11
+-5
+-5
+-5
+-16
+-5
++16
++7
+-10
+-20
+-14
+-18
++13
++9
+-10
++18
+-7
+-8
+-4
++13
++9
++18
++20
+-10
+-14
+-22
+-21
+-10
++20
+-7
+-9
++1
++11
++6
++12
++14
+-5
++16
++13
++8
+-2
+-13
+-2
++11
++21
++9
+-5
++1
++18
++6
++18
+-17
++3
++7
+-2
+-3
++1
++7
++17
++16
++4
++13
++7
++17
+-18
++17
++2
++19
+-11
++2
++2
++1
+-16
+-19
+-4
+-17
+-8
+-5
++12
+-8
++19
++3
++17
++3
++3
++8
++3
+-13
++12
+-7
++9
++16
++15
++3
+-6
+-10
++14
+-13
+-8
++4
++12
++19
++17
++18
+-12
+-11
++7
+-1
+-7
+-28
+-19
+-6
++2
++15
++3
+-12
+-15
++5
+-15
+-8
+-16
+-17
++8
+-7
++3
++6
+-18
++10
+-17
+-9
+-13
++20
+-13
+-12
+-12
++9
+-2
++6
+-10
+-1
++14
+-18
+-14
++2
++25
+-16
+-17
++19
++8
++14
+-15
+-17
++40
++21
+-19
++4
++3
+-2
++9
+-2
+-3
++15
+-9
+-18
++9
++7
++27
++3
++8
++6
++2
+-13
++4
+-16
++26
+-15
+-8
+-16
++17
+-18
++33
++9
++68
++8
++20
+-9
+-8
++28
++15
++15
++9
++12
++20
++5
++16
++22
+-5
++8
++14
++6
++6
++10
++10
++7
+-13
+-8
++10
++9
++13
+-15
+-15
++13
++8
++5
++25
+-10
++21
++16
++10
+-16
++1
+-57
++13
+-20
+-30
++2
++7
++15
+-18
+-28
+-13
++1
+-9
+-6
+-2
+-13
++11
+-4
+-1
+-9
+-13
+-13
++12
+-14
++12
+-13
+-7
+-2
+-15
+-2
++3
++32
++13
++12
+-4
+-19
+-5
++22
+-29
+-24
+-25
+-6
+-12
+-9
++3
+-15
++3
+-5
++20
+-10
+-34
+-77
+-9
+-9
+-23
+-6
++8
++9
++47
+-82
+-21
++38
+-61
++11
+-65
+-37
+-22
++2
++12
+-26
+-20
+-4
++6
+-7
++14
++6
++11
++19
+-32
++10
+-74
++9
+-64
+-59
+-92
+-10
+-92
+-18
+-23
+-64754
+-2
+-16
+-6
+-19
++6
+-12
+-10
++14
++9
++11
++12
++15
++2
+-14
+-11
++13
+-1
+-18
+-3
++19
++16
++12
++14
+-19
+-11
++9
+-7
++13
++20
+-1
++2
++13
++10
++15
++15
++13
+-15
+-7
+-10
++9
++2
++7
++18
+-9
++6
+-8
++4
++18
+-17
++12
++14
++14
+-15
+-12
+-17
++18
+-16
++6
+-13
+-23
+-5
++9
+-10
+-16
+-19
++1
++12
+-18
+-9
+-1
++5
+-9
++11
++1
++1
++17
+-20
++5
+-17
+-13
+-9
+-18
+-11
+-19
+-13
++11
+-4
++19
+-5
++9
++18
++8
+-12
+-10
+-14
++17
++20
++12
++15
+-22
+-12
++9
+-5
+-19
++18
++19
+-8
+-23
+-18
+-1
+-4
+-16
++1
+-16
++19
+-11
+-19
+-8
+-15
+-12
+-4
+-15
++10
++3
++15
+-19
++11
++5
++8
+-19
++3
+-18
++4
+-8
++1
++5
+-13
+-20
++7
+-8
+-2
++16
++13
+-8
+-12
++2
++3
++13
+-9
++15
++9
+-16
+-1
+-21
++8
+-17
+-6
+-2
+-18
+-10
+-6
+-13
+-19
+-1
++10
+-3
+-9
+-9
++8
++2
++17
+-3
++5
+-6
+-17
++13
++16
+-10
++3
++12
++15
+-13
+-12
+-23
++10
++16
++3
+-14
+-6
+-14
++11
++13
++20
++8
+-15
++19
+-10
++1
+-6
++14
++13
++7
+-15
+-1
+-5
+-3
+-19
++4
++7
+-13
+-12
+-19
++4
+-2
+-15
+-1
++10
+-13
+-1
+-10
++7
++11
+-1
+-9
++14
+-9
+-15
++14
+-7
+-15
+-16
+-14
++12
+-5
+-5
++11
+-5
++7
++18
+-1
+-14
+-14
+-1
+-12
++1
++1
++6
++18
+-11
+-12
+-14
+-2
++1
+-3
+-20
+-8
+-8
+-3
++17
++7
++4
++21
++19
+-10
++6
++20
++16
+-17
++7
+-11
++7
++8
+-2
++20
+-14
++21
++4
++3
++3
+-7
++23
+-17
+-24
++5
++15
+-27
+-10
+-2
+-12
+-23
++2
+-25
+-11
++19
+-30
+-17
+-15
++2
++16
++8
++10
++1
+-15
+-10
++9
+-18
+-17
++23
+-15
++17
++6
+-19
++15
+-7
++2
+-15
++21
+-24
+-15
+-4
++14
++2
++18
++34
++6
++8
+-19
+-6
+-12
++3
+-15
+-12
+-37
++2
++9
+-22
+-31
+-5
++1
+-16
++19
++10
+-19
+-22
+-14
+-6
+-18
++10
+-6
++17
++18
+-19
+-15
++3
+-16
++20
++10
+-19
++10
+-6
++20
++19
++11
+-17
++13
+-20
+-4
++20
+-18
+-12
+-8
+-18
+-18
++6
+-2
++5
+-17
+-7
+-12
+-5
+-9
++11
+-9
+-11
+-12
+-4
+-4
+-1
+-2
++14
+-13
++17
+-12
+-19
++23
++12
+-5
++16
++15
+-9
+-12
+-11
+-17
+-17
+-6
++22
++21
++12
++19
++13
++22
++19
+-11
++2
+-7
++8
+-12
+-18
++6
+-5
+-13
+-34
+-11
+-1
+-4
++20
++63
+-4
+-14
+-24
+-20
+-31
+-90
+-8
+-9
+-21
+-16
++27
+-19
+-9
+-183
+-3
+-10
+-16
++9
+-10
++11
++11
++19
++32
+-2
+-3
+-81
++12
++16
++5
+-1
++17
+-28
++32
++22
++39
+-115
+-2
++183
++108
++1
+-19
++14
++3
++39
+-10
++33
++14
+-161
+-885
+-63592
+-9
+-10
++3
+-4
+-4
++19
++16
++20
++14
+-3
+-18
+-10
+-5
+-7
++17
+-16
++5
+-4
+-18
++10
++1
++18
++1
++2
+-19
+-6
+-19
+-12
+-13
+-4
++20
+-7
++2
+-4
++15
+-21
+-4
+-16
+-5
++17
+-10
++9
+-5
++18
++21
+-6
++9
+-19
+-6
++17
+-2
+-5
++24
++130793
\ No newline at end of file