diff --git a/.aoc-cache/10.txt b/.aoc-cache/10.txt
new file mode 100644
index 0000000..a554eb8
--- /dev/null
+++ b/.aoc-cache/10.txt
@@ -0,0 +1,138 @@
+addx 1
+addx 5
+addx -1
+addx 20
+addx -14
+addx -1
+addx 5
+addx 13
+addx -12
+addx 3
+addx 3
+addx 3
+addx 1
+addx 4
+noop
+noop
+addx 1
+noop
+noop
+addx 4
+noop
+addx -35
+addx 11
+addx -1
+addx -7
+addx 5
+addx 2
+addx 3
+addx -2
+addx 2
+addx 5
+addx 5
+noop
+noop
+addx -2
+addx 2
+noop
+addx 3
+addx 2
+addx 7
+noop
+noop
+addx 3
+addx -2
+addx -36
+noop
+addx 25
+addx -22
+addx 7
+noop
+addx -2
+noop
+noop
+noop
+addx 5
+addx 5
+addx 4
+noop
+addx -2
+addx 5
+addx -4
+addx 5
+addx 4
+noop
+addx -29
+addx 32
+addx -23
+addx -12
+noop
+addx 7
+noop
+addx -2
+addx 4
+addx 3
+addx 20
+addx 3
+addx -20
+addx 5
+addx 16
+addx -15
+addx 6
+noop
+noop
+noop
+addx 5
+noop
+addx 5
+noop
+noop
+noop
+addx -37
+addx 2
+addx -2
+addx 7
+noop
+addx -2
+addx 5
+addx 2
+addx 3
+addx -2
+addx 2
+addx 5
+addx 2
+addx -6
+addx -15
+addx 24
+addx 2
+noop
+addx 3
+addx -8
+addx 15
+addx -14
+addx 15
+addx -38
+noop
+noop
+addx 21
+addx -14
+addx 1
+addx 5
+noop
+addx -2
+addx 7
+addx -1
+addx 5
+noop
+addx 2
+addx 3
+addx 3
+addx -2
+addx 4
+addx 2
+addx -17
+addx 20
+noop
+noop
+noop
+noop
diff --git a/src/bin/day_10.rs b/src/bin/day_10.rs
new file mode 100644
index 0000000..86811a6
--- /dev/null
+++ b/src/bin/day_10.rs
@@ -0,0 +1,102 @@
+use std::{str::FromStr, fs::File, io::Write};
+
+use aoc_2022::prelude::*;
+
+enum Instruction {
+    Addx(isize),
+    Noop,
+}
+
+impl FromStr for Instruction {
+    type Err = color_eyre::Report;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let tokens = s.split_ascii_whitespace().collect::<Vec<_>>();
+        match &tokens[..] {
+            ["noop"] => Ok(Self::Noop),
+            ["addx", v] => Ok(Self::Addx(v.parse()?)),
+            _ => bail!("invalid instruction"),
+        }
+    }
+}
+
+type Input = Vec<Instruction>;
+
+fn parse(s: &str) -> Result<Input> {
+    let mut instructions = vec![];
+    for line in s.lines() {
+        instructions.push(line.parse()?);
+    }
+    Ok(instructions)
+}
+
+#[aoc(day = 10, parse = parse, test_cases = ["day_10.txt"])]
+fn day_10(input: Input) -> Result<()> {
+    // Part 1
+    let mut x = 1;
+    let mut cycle = 0;
+
+    let mut total = 0;
+
+    for instruction in &input {
+        cycle += 1;
+        if cycle % 40 == 20 {
+            total += dbg!(cycle * x);
+        }
+        match instruction {
+            Instruction::Noop => {},
+            &Instruction::Addx(v) => {
+                cycle += 1;
+                if cycle % 40 == 20 {
+                    total += dbg!(cycle * x);
+                }
+                x += v;
+            }
+        }
+
+        if cycle >= 221 {
+            break;
+        }
+    }
+    println!("Part one: {total}");
+
+    // Part 2
+    println!("Part two: ");
+
+    let mut x: isize = 0;
+    let mut cycle = 0;
+    
+    let mut output = std::io::stdout();
+
+    for instruction in &input {
+        cycle += 1;
+        let h_pixel = (cycle - 1) % 40;
+        if h_pixel == x || h_pixel == x - 1 || h_pixel == x + 1 {
+            write!(output, "#")?;
+        } else {
+            write!(output, " ")?;
+        }
+        if h_pixel == 39 {
+            writeln!(output, )?;
+        }
+
+        match instruction {
+            Instruction::Noop => {},
+            &Instruction::Addx(v) => {
+                cycle += 1;
+                x += v;
+                let h_pixel = (cycle - 1) % 40;
+                if h_pixel == x || h_pixel == x - 1 || h_pixel == x + 1 {
+                    write!(output, "#")?;
+                } else {
+                    write!(output, " ")?;
+                }
+                if h_pixel == 39 {
+                    writeln!(output, )?;
+                }
+            }
+        }
+    }
+
+    Ok(())
+}
diff --git a/src/lib.rs b/src/lib.rs
index 567452e..84472aa 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -50,6 +50,6 @@ impl std::io::Write for NullWriter {
 
 pub mod prelude {
     pub use super::{data, load_data};
-    pub use color_eyre::{eyre::eyre, Result};
+    pub use color_eyre::{eyre::{bail, eyre}, Result};
     pub use aoc_proc::aoc;
 }
diff --git a/test_cases/day_10.txt b/test_cases/day_10.txt
new file mode 100644
index 0000000..94cd0a8
--- /dev/null
+++ b/test_cases/day_10.txt
@@ -0,0 +1,146 @@
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop
\ No newline at end of file