diff --git a/2021/01/01.exs b/2021/01/01.exs
new file mode 100644
index 0000000..4d02868
--- /dev/null
+++ b/2021/01/01.exs
@@ -0,0 +1,20 @@
+lines = File.stream!("input.txt")
+  |> Stream.map(&String.trim/1)
+  |> Stream.map(&String.to_integer/1)
+  |> Enum.to_list
+
+# Part 1
+count = lines
+  |> Enum.chunk_every(2, 1, :discard)
+  |> Enum.count(fn [a, b] -> a < b end)
+
+IO.puts("Part 1: #{count}")
+
+# Part 2
+count = lines
+  |> Enum.chunk_every(3, 1, :discard)
+  |> Enum.map(&Enum.sum/1)
+  |> Enum.chunk_every(2, 1, :discard)
+  |> Enum.count(fn [a, b] -> a < b end)
+
+IO.puts("Part 2: #{count}")
diff --git a/2021/01/input.txt b/2021/01/input.txt
new file mode 100644
index 0000000..202ce7e
--- /dev/null
+++ b/2021/01/input.txt
@@ -0,0 +1,2000 @@
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diff --git a/2021/02/02.exs b/2021/02/02.exs
new file mode 100644
index 0000000..a3eaa6d
--- /dev/null
+++ b/2021/02/02.exs
@@ -0,0 +1,35 @@
+lines = File.stream!("input.txt")
+  |> Stream.map(&String.trim/1)
+  |> Stream.map(&(String.split(&1, " ", trim: true)))
+  |> Stream.map(fn [dir, val] -> [dir, String.to_integer(val)] end)
+  |> Enum.to_list
+
+# Part 1
+result = lines
+  |> Enum.reduce(
+       {0, 0},
+       fn line, {position, depth} ->
+         case line do
+           ["forward", value] -> {position + value, depth}
+           ["down", value] -> {position, depth + value}
+           ["up", value] -> {position, depth - value}
+         end
+       end
+     )
+
+IO.puts(elem(result, 0) * elem(result, 1))
+
+# Part 2
+result = lines
+  |> Enum.reduce(
+       {0, 0, 0},
+       fn line, {position, depth, aim} ->
+         case line do
+           ["forward", value] -> {position + value, depth + (aim * value), aim}
+           ["down", value] -> {position, depth, aim + value}
+           ["up", value] -> {position, depth, aim - value}
+         end
+       end
+     )
+
+IO.puts(elem(result, 0) * elem(result, 1))
diff --git a/2021/02/input.txt b/2021/02/input.txt
new file mode 100644
index 0000000..b71a00f
--- /dev/null
+++ b/2021/02/input.txt
@@ -0,0 +1,1000 @@
+forward 3
+down 7
+forward 7
+down 4
+down 9
+down 7
+forward 5
+forward 9
+forward 3
+forward 8
+down 4
+down 6
+down 3
+forward 7
+forward 1
+forward 4
+down 1
+forward 7
+forward 9
+down 3
+down 1
+down 5
+forward 8
+down 2
+down 9
+forward 3
+down 9
+down 7
+down 6
+down 1
+forward 4
+forward 9
+forward 8
+down 3
+down 9
+down 5
+forward 5
+down 7
+down 7
+up 1
+down 2
+up 1
+down 7
+up 1
+up 1
+down 8
+down 8
+forward 2
+down 5
+forward 9
+forward 8
+forward 4
+up 2
+down 9
+down 7
+forward 4
+up 7
+up 4
+down 4
+down 3
+forward 8
+down 8
+up 2
+up 1
+forward 3
+up 6
+up 8
+down 5
+down 4
+down 4
+forward 1
+down 8
+forward 3
+forward 5
+forward 4
+forward 2
+forward 7
+up 5
+up 2
+forward 2
+forward 5
+down 4
+up 6
+forward 3
+forward 1
+forward 1
+forward 6
+forward 7
+forward 1
+forward 8
+forward 4
+forward 4
+forward 8
+down 6
+down 8
+forward 4
+forward 1
+down 8
+forward 3
+forward 3
+forward 9
+forward 9
+forward 3
+up 1
+down 2
+down 5
+forward 4
+forward 5
+forward 7
+forward 4
+forward 4
+up 5
+forward 1
+down 9
+down 9
+down 1
+up 7
+down 8
+up 6
+down 4
+forward 7
+down 8
+down 1
+forward 4
+forward 5
+forward 9
+down 2
+forward 7
+forward 7
+up 2
+up 1
+forward 9
+forward 1
+forward 7
+up 3
+forward 8
+forward 1
+down 6
+down 6
+down 4
+forward 2
+forward 1
+down 3
+down 4
+down 2
+forward 9
+up 8
+down 4
+down 3
+down 1
+down 1
+forward 6
+forward 6
+down 7
+forward 1
+forward 5
+forward 9
+forward 5
+forward 1
+up 8
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+up 3
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+down 5
+up 8
+down 4
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+forward 2
+up 7
+forward 9
+down 9
+forward 1
+down 5
+forward 8
+down 7
+forward 8
+forward 1
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+down 4
+down 1
+forward 4
+up 6
+down 3
+down 1
+forward 1
+forward 1
+up 8
+down 9
+forward 8
+forward 5
+down 5
+forward 1
+up 9
+down 6
+down 4
+up 2
+forward 5
+down 7
+up 1
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+down 4
+up 3
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+down 5
+up 2
+forward 1
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+down 1
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+up 6
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+down 2
+up 1
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+forward 9
+up 5
+forward 8
+up 9
+down 1
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+down 9
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+forward 2
+down 1
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+forward 4
+down 4
+forward 4
+up 8
+down 6
+forward 3
+up 2
+up 6
+down 1
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+down 1
+up 6
+down 9
+up 6
+forward 9
+down 4
+forward 3
+forward 1
+up 7
+down 1
+forward 5
+up 1
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+forward 5
+down 5
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+up 7
+forward 4
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diff --git a/2021/03/03.exs b/2021/03/03.exs
new file mode 100644
index 0000000..c1033a6
--- /dev/null
+++ b/2021/03/03.exs
@@ -0,0 +1,114 @@
+use Bitwise
+
+lines = File.stream!("input.txt")
+  |> Stream.map(&String.trim/1)
+  |> Enum.to_list
+
+# Utilities
+defmodule Utils do
+  def more_frequent(frequencies) do
+    cond do
+      frequencies[0] == nil ->
+        "1"
+      frequencies[1] == nil ->
+        "0"
+      frequencies[0] > frequencies[1] ->
+        "0"
+      true ->
+        "1"
+    end
+  end
+
+  def less_frequent(frequencies) do
+    cond do
+      frequencies[0] == nil ->
+        "1"
+      frequencies[1] == nil ->
+        "0"
+      frequencies[0] > frequencies[1] ->
+        "1"
+      true ->
+        "0"
+    end
+  end
+
+  def most_frequent_at(data, position) do
+    data
+      |> Enum.map(fn line -> String.at(line, position) end)
+      |> Enum.map(fn char -> String.to_integer(char) end)
+      |> Enum.frequencies
+      |> Utils.more_frequent
+  end
+
+  def least_frequent_at(data, position) do
+    data
+    |> Enum.map(fn line -> String.at(line, position) end)
+    |> Enum.map(fn char -> String.to_integer(char) end)
+    |> Enum.frequencies
+    |> Utils.less_frequent
+  end
+
+  def filter_by_char(data, char, position) do
+    data
+      |> Enum.filter(fn line -> String.at(line, position) == char end)
+  end
+
+  def filter_by_freq(data, position, line_length, comparison_fn) do
+    if position > line_length do
+      data
+    else
+      char = comparison_fn.(data, position)
+
+      data
+        |> Utils.filter_by_char(char, position)
+        |> Utils.filter_by_freq(position + 1, line_length, comparison_fn)
+    end
+  end
+end
+
+# Part 1
+line_length = List.first(lines)
+  |> String.length
+
+binary_frequencies =
+  for i <- 0..(line_length - 1) do
+    lines
+      |> Enum.map(fn line -> String.at(line, i) end)
+      |> Enum.map(fn char -> String.to_integer(char) end)
+      |> Enum.frequencies
+  end
+
+gamma_rate = binary_frequencies
+  |> Enum.map(fn tuple -> Utils.more_frequent(tuple) end)
+  |> Enum.join
+  |> String.to_integer(2)
+
+epsilon = binary_frequencies
+  |> Enum.map(fn tuple -> Utils.less_frequent(tuple) end)
+  |> Enum.join
+  |> String.to_integer(2)
+
+power_consumption = gamma_rate * epsilon
+
+IO.puts("---- PART 1 ----")
+IO.puts("Gamma rate: #{gamma_rate}")
+IO.puts("Epsilon: #{epsilon}")
+IO.puts("Power consumption: #{power_consumption}")
+
+# Part 2
+oxygen_rating = Utils.filter_by_freq(lines, 0, line_length - 1, &Utils.most_frequent_at/2)
+  |> List.first
+  |> String.to_integer(2)
+
+co2_subscriber_rating = Utils.filter_by_freq(lines, 0, line_length - 1, &Utils.least_frequent_at/2)
+  |> List.first
+  |> String.to_integer(2)
+
+life_support_rating = oxygen_rating * co2_subscriber_rating
+
+IO.puts("\n---- PART 2 ----")
+IO.puts("O2 rating: #{oxygen_rating}")
+IO.puts("C02 rating: #{co2_subscriber_rating}")
+IO.puts("Life support rating: #{life_support_rating}")
+
+
diff --git a/2021/03/input.txt b/2021/03/input.txt
new file mode 100644
index 0000000..f398604
--- /dev/null
+++ b/2021/03/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2021/03/test.txt b/2021/03/test.txt
new file mode 100644
index 0000000..665fd57
--- /dev/null
+++ b/2021/03/test.txt
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010
\ No newline at end of file
diff --git a/README.md b/README.md
index 037187e..07c692f 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ Some editions were finished later, or even done in a different time (for example
 | [2015](2015) | [Go][lang-go]         | Day 12 part 2 done using JavaScript.                            |
 | [2016](2016) | [C#][lang-c#]         |                                                                 |
 | [2017](2017) | [Python][lang-python] |                                                                 |
+| [2021](2021) | [Elixir][lang-elixir] | Why have i chosen Elixir...                                     |
 | [2022](2022) | [TypeScript][lang-ts] | With some help from [Radash][lib-radash] and [Ramda][lib-ramda] |
 | [2023](2023) | [TypeScript][lang-ts] | With some help from [Radash][lib-radash] and [Ramda][lib-ramda] |