diff --git a/src/bin/day9.rs b/src/bin/day9.rs
new file mode 100644
index 0000000..990ea6d
--- /dev/null
+++ b/src/bin/day9.rs
@@ -0,0 +1,66 @@
+use std::time::Instant;
+
+use aoc_2025::{load, print_res};
+use bstr::BString;
+
+pub struct Point2 {
+    x: u64,
+    y: u64,
+}
+
+type Parsed = Vec<Point2>;
+
+#[inline(never)]
+pub fn parsing(input: &BString) -> color_eyre::Result<Parsed> {
+    str::from_utf8(input)?
+        .lines()
+        .map(|v| {
+            let Some((x, y)) = v.split_once(',') else {
+                color_eyre::eyre::bail!("Malformed point: {v}");
+            };
+            Ok(Point2 {
+                x: x.parse()?,
+                y: y.parse()?,
+            })
+        })
+        .collect()
+}
+
+#[inline(never)]
+pub fn part1(input: Parsed) {
+    let max_area = input
+        .iter()
+        .enumerate()
+        .flat_map(|(ia, a)| input.iter().skip(ia + 1).map(move |b| (a, b)))
+        .map(|(a, b)| (a.x.abs_diff(b.x) + 1) * (a.y.abs_diff(b.y) + 1))
+        .max()
+        .unwrap();
+
+    print_res!("Max area: {max_area}");
+}
+
+#[inline(never)]
+pub fn part2(input: Parsed) {
+    todo!("todo part2")
+}
+
+pub fn main() -> color_eyre::Result<()> {
+    let context = load()?;
+
+    let start = Instant::now();
+    let parsed = parsing(&context.input)?;
+    let elapsed = humantime::format_duration(start.elapsed());
+
+    let start = Instant::now();
+    if context.part == 1 {
+        part1(parsed);
+    } else {
+        part2(parsed);
+    }
+    let elapsed_part = humantime::format_duration(start.elapsed());
+
+    println!("  Parsing: {elapsed}");
+    println!("  Solving: {elapsed_part}");
+
+    Ok(())
+}