diff --git a/day09/Cargo.lock b/day09/Cargo.lock
new file mode 100644
index 0000000000000000000000000000000000000000..87de8b77df264ab9eb3a1a3d938843fb76aee120
--- /dev/null
+++ b/day09/Cargo.lock
@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "day09"
+version = "0.1.0"
diff --git a/day09/Cargo.toml b/day09/Cargo.toml
new file mode 100644
index 0000000000000000000000000000000000000000..c638181c315157e12ef2ed9f50bb9e94cd053708
--- /dev/null
+++ b/day09/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "day09"
+version = "0.1.0"
+authors = ["Philip Molares <philip.molares@udo.edu>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/day09/input.txt b/day09/input.txt
new file mode 100644
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--- /dev/null
+++ b/day09/input.txt
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\ No newline at end of file
diff --git a/day09/src/main.rs b/day09/src/main.rs
new file mode 100644
index 0000000000000000000000000000000000000000..32dc870fe260bf612e78acef00a4a7b19dc0de11
--- /dev/null
+++ b/day09/src/main.rs
@@ -0,0 +1,56 @@
+use std::fs::File;
+use std::io::{self, prelude::*, BufReader};
+
+fn check_sums(numbers: &[i64], sum: i64) -> bool {
+ let mut index = 1;
+ for number in numbers {
+ for number2 in &numbers[index..] {
+ if number + number2 == sum {
+ return true;
+ }
+ }
+ index += 1;
+ }
+ return false;
+}
+
+fn main() -> io::Result<()> {
+ println!("Advent of Code 2020 – Day 9:");
+
+ let file = File::open("input.txt")?;
+ let reader = BufReader::new(file);
+
+ let input = reader
+ .lines()
+ .map(|l| l.unwrap().parse::<i64>().unwrap())
+ .collect::<Vec<i64>>();
+
+ let mut answer1 = 0;
+
+ for numbers in input.windows(26) {
+ if !check_sums(&numbers[..25], *numbers.last().unwrap()) {
+ answer1 = *numbers.last().unwrap();
+ break;
+ }
+ }
+
+ println!("Answer Part 1: {}", answer1);
+
+ let mut answer2 = 0;
+
+ 'outer: for window_size in 2..input.len() {
+ for numbers in input.windows(window_size) {
+ if numbers.iter().sum::<i64>() == answer1 {
+ let mut list: Vec<i64> = numbers.clone().iter().map(|n| *n).collect();
+ list.sort();
+ answer2 = list.first().unwrap() + list.last().unwrap();
+ break 'outer;
+ }
+ }
+ }
+
+ println!("Answer Part 2: {}", answer2);
+
+
+ Ok(())
+}