diff --git a/src/09part1.rs b/src/09part1.rs
new file mode 100644
index 0000000..13d7dbc
--- /dev/null
+++ b/src/09part1.rs
@@ -0,0 +1,37 @@
+use std::fs;
+
+fn main() {
+    let file_path = "input/09input.txt";
+    let contents = fs::read_to_string(file_path).expect("should read file");
+    let lines = contents.lines();
+    let mut total = 0;
+    for line in lines {
+        let split_line = line.split_whitespace();
+        let sub_seq: Vec<i128> = split_line.map(|item| item.parse::<i128>().ok().unwrap()).collect();
+        let mut seq = vec![sub_seq];
+        let mut found_zeros = false;
+        while !found_zeros {
+            found_zeros = true;
+            let curr_seq = seq.last().unwrap();
+            let mut new_seq: Vec<i128> = Vec::new();
+            for i in 0..curr_seq.len()-1 {
+                let diff = curr_seq[i+1] - curr_seq[i];
+                new_seq.push(diff);
+                found_zeros = found_zeros && diff == 0;
+            }
+            seq.push(new_seq);
+        }
+        seq.reverse();
+        for i in 0..seq.len() {
+            if i == 0 {
+                seq[i].push(0);
+            } else {
+                let a = seq[i].last().unwrap().to_owned();
+                let b = seq[i-1].last().unwrap().to_owned();
+                seq[i].push(a + b);
+            }
+        }
+        total += seq.last().unwrap().last().unwrap();
+    }
+    println!("{}", total);
+}
diff --git a/src/09part2.rs b/src/09part2.rs
new file mode 100644
index 0000000..e642c42
--- /dev/null
+++ b/src/09part2.rs
@@ -0,0 +1,38 @@
+use std::fs;
+
+fn main() {
+    let file_path = "input/09input.txt";
+    let contents = fs::read_to_string(file_path).expect("should read file");
+    let lines = contents.lines();
+    let mut total = 0;
+    for line in lines {
+        let split_line = line.split_whitespace();
+        let mut sub_seq: Vec<i128> = split_line.map(|item| item.parse::<i128>().ok().unwrap()).collect();
+        sub_seq.reverse();
+        let mut seq = vec![sub_seq];
+        let mut found_zeros = false;
+        while !found_zeros {
+            found_zeros = true;
+            let curr_seq = seq.last().unwrap();
+            let mut new_seq: Vec<i128> = Vec::new();
+            for i in 0..curr_seq.len()-1 {
+                let diff = curr_seq[i+1] - curr_seq[i];
+                new_seq.push(diff);
+                found_zeros = found_zeros && diff == 0;
+            }
+            seq.push(new_seq);
+        }
+        seq.reverse();
+        for i in 0..seq.len() {
+            if i == 0 {
+                seq[i].push(0);
+            } else {
+                let a = seq[i].last().unwrap().to_owned();
+                let b = seq[i-1].last().unwrap().to_owned();
+                seq[i].push(a + b);
+            }
+        }
+        total += seq.last().unwrap().last().unwrap();
+    }
+    println!("{}", total);
+}