diff --git a/2021/README.md b/2021/README.md
index 43c4966..445d0fb 100644
--- a/2021/README.md
+++ b/2021/README.md
@@ -4,12 +4,12 @@
 
 | Day | Part 1 | Part 2 | Language |
 | :-: | :----: | :----: | :------- |
-| 01  |   ✓    |   ✓    | Ruby     |
-| 02  |   ✓    |   ✓    | Ada      |
-| 03  |   ✓    |   ✓    | Perl     |
-| 04  |   ✓    |   ✓    | Go       |
-| 05  |   ✓    |   ✓    | Nim      |
-| 06  |        |        |          |
+| 01  |   ✓    |   ✓    | [Ruby]   |
+| 02  |   ✓    |   ✓    | [Ada]    |
+| 03  |   ✓    |   ✓    | [Perl]   |
+| 04  |   ✓    |   ✓    | [Go]     |
+| 05  |   ✓    |   ✓    | [Nim]    |
+| 06  |   ✓    |   ✓    | [Inko]   |
 | 07  |        |        |          |
 | 08  |        |        |          |
 | 09  |        |        |          |
@@ -33,3 +33,12 @@
 ## Additional Challenges
 
 -   Attempt to solve each day in a different language.
+
+<!-- links -->
+
+[ruby]: https://www.ruby-lang.org
+[ada]: https://www.adacore.com/about-ada
+[perl]: https://www.perl.org
+[go]: https://go.dev
+[nim]: https://nim-lang.org
+[inko]: https://inko-lang.org
diff --git a/2021/day-06/common.inko b/2021/day-06/common.inko
new file mode 100644
index 0000000..428259f
--- /dev/null
+++ b/2021/day-06/common.inko
@@ -0,0 +1,64 @@
+import std::fs::file::(ReadOnlyFile as File)
+import std::stdio::stdout
+import std::io::(Error as IoError)
+
+def read_file(path: String) !! IoError -> Array!(Integer) {
+    let file = try File.new(path)
+    let mut content = try file.read_string
+    content = content.slice(0, content.length - 1)
+    content.split(",").map do (c) { c.to_integer }.to_array
+}
+
+def count_fish(initial: Array!(Integer), days: Integer) -> Integer {
+    let mut day = 0
+
+    let mut timers = Array.filled(9, 0)
+    initial.iter.each do (n) { timers[n] = timers[n] + 1 }
+
+    while({day < days}) {
+        let mut new_timers = Array.filled(9, 0)
+
+        timers.each_with_index do (timer, idx) {
+            new_timers[idx - 1] = new_timers[idx - 1] + timer
+
+            (idx == 0).if_true {
+                (timer != 0).if_true {
+                    new_timers[6] = new_timers[6] + timer
+                }
+            }
+        }
+
+        timers = new_timers
+
+        day += 1
+    }
+
+    timers.iter.reduce(0) do (acc, num) { acc + num }
+}
+
+def count_fish_naive(initial: Array!(Integer), days: Integer) -> Integer {
+    let mut fish = initial
+    let mut day = 0
+
+    while({day < days}) {
+        let mut new_fish = Array.new()
+
+        fish = fish
+            .iter
+            .map do (f) {
+                (f == 0).if(true: {
+                    new_fish.push(8)
+                    6
+                }, false: {
+                    f - 1
+                })
+            }
+            .to_array
+
+        fish.append(new_fish)
+
+        day += 1
+    }
+
+    fish.length
+}
diff --git a/2021/day-06/inputs/puzzle.txt b/2021/day-06/inputs/puzzle.txt
new file mode 100644
index 0000000..6b5d079
--- /dev/null
+++ b/2021/day-06/inputs/puzzle.txt
@@ -0,0 +1 @@
+3,5,3,1,4,4,5,5,2,1,4,3,5,1,3,5,3,2,4,3,5,3,1,1,2,1,4,5,3,1,4,5,4,3,3,4,3,1,1,2,2,4,1,1,4,3,4,4,2,4,3,1,5,1,2,3,2,4,4,1,1,1,3,3,5,1,4,5,5,2,5,3,3,1,1,2,3,3,3,1,4,1,5,1,5,3,3,1,5,3,4,3,1,4,1,1,1,2,1,2,3,2,2,4,3,5,5,4,5,3,1,4,4,2,4,4,5,1,5,3,3,5,5,4,4,1,3,2,3,1,2,4,5,3,3,5,4,1,1,5,2,5,1,5,5,4,1,1,1,1,5,3,3,4,4,2,2,1,5,1,1,1,4,4,2,2,2,2,2,5,5,2,4,4,4,1,2,5,4,5,2,5,4,3,1,1,5,4,5,3,2,3,4,1,4,1,1,3,5,1,2,5,1,1,1,5,1,1,4,2,3,4,1,3,3,2,3,1,1,4,4,3,2,1,2,1,4,2,5,4,2,5,3,2,3,3,4,1,3,5,5,1,3,4,5,1,1,3,1,2,1,1,1,1,5,1,1,2,1,4,5,2,1,5,4,2,2,5,5,1,5,1,2,1,5,2,4,3,2,3,1,1,1,2,3,1,4,3,1,2,3,2,1,3,3,2,1,2,5,2
diff --git a/2021/day-06/inputs/sample.txt b/2021/day-06/inputs/sample.txt
new file mode 100644
index 0000000..55129f1
--- /dev/null
+++ b/2021/day-06/inputs/sample.txt
@@ -0,0 +1 @@
+3,4,3,1,2
diff --git a/2021/day-06/part_one.inko b/2021/day-06/part_one.inko
new file mode 100644
index 0000000..6cd506e
--- /dev/null
+++ b/2021/day-06/part_one.inko
@@ -0,0 +1,15 @@
+import std::stdio::stdout
+import std::env
+import std::error::Error
+import common
+
+def main() !! Error {
+    let path = env.arguments[0]
+    let initial_fish = try common.read_file(path)
+
+    let fish_count = common.count_fish(initial_fish, 80)
+
+    stdout.print(fish_count)
+}
+
+try! main
diff --git a/2021/day-06/part_two.inko b/2021/day-06/part_two.inko
new file mode 100644
index 0000000..0352d44
--- /dev/null
+++ b/2021/day-06/part_two.inko
@@ -0,0 +1,15 @@
+import std::stdio::stdout
+import std::env
+import std::error::Error
+import common
+
+def main() !! Error {
+    let path = env.arguments[0]
+    let initial_fish = try common.read_file(path)
+
+    let fish_count = common.count_fish(initial_fish, 256)
+
+    stdout.print(fish_count)
+}
+
+try! main
diff --git a/README.md b/README.md
index 370ad0c..a87990d 100644
--- a/README.md
+++ b/README.md
@@ -8,4 +8,4 @@
 -   [2018](2018/README.md) (0% completed)
 -   [2019](2019/README.md) (0% completed)
 -   [2020](2020/README.md) (16% completed)
--   [2021](2021/README.md) (20% completed)
+-   [2021](2021/README.md) (24% completed)