diff --git a/december_11/Cargo.toml b/december_11/Cargo.toml
new file mode 100644
index 0000000..bcef53a
--- /dev/null
+++ b/december_11/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "december_11"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/december_11/example.txt b/december_11/example.txt
new file mode 100644
index 0000000..a3819c9
--- /dev/null
+++ b/december_11/example.txt
@@ -0,0 +1,10 @@
+5483143223
+2745854711
+5264556173
+6141336146
+6357385478
+4167524645
+2176841721
+6882881134
+4846848554
+5283751526
\ No newline at end of file
diff --git a/december_11/input.txt b/december_11/input.txt
new file mode 100644
index 0000000..d468d51
--- /dev/null
+++ b/december_11/input.txt
@@ -0,0 +1,10 @@
+6318185732
+1122687135
+5173237676
+8754362612
+5718474666
+8443654137
+1247634346
+1446514585
+6717288267
+1727871228
\ No newline at end of file
diff --git a/december_11/src/main.rs b/december_11/src/main.rs
new file mode 100644
index 0000000..3228cdc
--- /dev/null
+++ b/december_11/src/main.rs
@@ -0,0 +1,92 @@
+use std::fs::File;
+use std::io::{BufReader};
+use std::io::prelude::*;
+
+const RADIX: u32 = 10;
+
+static mut LINE_VEC: Vec<Vec<u32>> = Vec::new();
+static mut TOTAL_FLASHES: u32 = 0;
+
+const STEPS: u32 = 300;
+
+fn main(){
+    let file = File::open("./input.txt").expect("Read failed");
+    let reader = BufReader::new(file);
+
+
+
+   for line in reader.lines(){
+    let line_as_string = line.unwrap();
+    let line_as_int_vec = line_as_string.chars().map(|x| x.to_digit(RADIX).unwrap()).collect::<Vec<u32>>();
+    unsafe{LINE_VEC.push(line_as_int_vec);}
+
+   }
+   unsafe {
+        let height = LINE_VEC.len();
+        let width = LINE_VEC[0].len();
+
+
+        for _i in 1..=STEPS {
+            // Energy of each Octopus increases by 1
+            for line_nr in 0..height {
+                for column_nr in 0..width {
+                    LINE_VEC[line_nr][column_nr] += 1;
+                }
+            }
+
+            // Flash all Octopus over 9 and reset to 9
+            for line_nr in 0..height {
+                for column_nr in 0..width {
+                    if LINE_VEC[line_nr][column_nr] > 9 {
+                        flash(line_nr, column_nr, height, width);
+                    }
+                }
+            }
+            // Reset all flashed to 0
+            for line_nr in 0..height {
+                for column_nr in 0..width {
+                    if LINE_VEC[line_nr][column_nr] >98 {
+                        LINE_VEC[line_nr][column_nr] = 0;
+                    }
+                }
+            }
+            // Check if all flash
+            let mut all_flashed = true;
+            for line_nr in 0..height {
+                for column_nr in 0..width {
+                    if LINE_VEC[line_nr][column_nr] != 0 {
+                        all_flashed = false;
+                    }
+                }
+            }
+            if all_flashed {println!("All Flashed at step {}", _i);}
+        }
+
+    }
+
+    unsafe { println!("Total flashes: {}", TOTAL_FLASHES); }
+}
+
+
+fn flash(line_nr: usize, column_nr: usize, height: usize, width: usize) {
+    unsafe {
+        //Set Current Octopus to 0
+        if LINE_VEC[line_nr][column_nr] == 10 || LINE_VEC[line_nr][column_nr] == 9 {
+            LINE_VEC[line_nr][column_nr] = 99;
+            TOTAL_FLASHES += 1;
+
+            if line_nr > 0 && column_nr > 0 {flash(line_nr - 1, column_nr - 1, height, width);}
+            if line_nr > 0 {flash(line_nr - 1, column_nr, height, width);}
+            if line_nr > 0 && column_nr < width - 1 {flash(line_nr - 1, column_nr + 1, height, width);}
+
+            if column_nr > 0 {flash(line_nr, column_nr - 1, height, width);}
+            if column_nr < width - 1 {flash(line_nr , column_nr + 1, height, width);}
+
+            if line_nr < height - 1 && column_nr > 0 {flash(line_nr + 1, column_nr - 1, height, width);}
+            if line_nr < height - 1 {flash(line_nr + 1, column_nr, height, width);}
+            if line_nr < height - 1 && column_nr < width - 1 {flash(line_nr + 1, column_nr + 1, height, width);}
+        } else {
+            LINE_VEC[line_nr][column_nr] += 1;
+        }
+    }
+}