diff --git a/nandu/src/main.rs b/nandu/src/main.rs
index a777ed2..28e76de 100644
--- a/nandu/src/main.rs
+++ b/nandu/src/main.rs
@@ -3,6 +3,7 @@ mod nandu;
 use anyhow::Result;
 use clap::Parser;
 use nandu::Environment;
+use std::arch::x86_64::_mm256_stream_pd;
 use std::path::Path;
 
 #[derive(Parser, Debug)]
@@ -18,7 +19,9 @@ fn main() -> Result<()> {
 
     let env = Environment::new(Path::new(&args.file))?;
 
-    println!("{:#?}", env);
+    let state = env.simulate(vec![false, false])?;
+
+    println!("State: {:?}", state);
 
     Ok(())
 }
diff --git a/nandu/src/nandu/mod.rs b/nandu/src/nandu/mod.rs
index a8ddc41..9e7d2ff 100644
--- a/nandu/src/nandu/mod.rs
+++ b/nandu/src/nandu/mod.rs
@@ -7,9 +7,9 @@ use std::path::Path;
 
 #[derive(Debug)]
 pub struct Environment {
-    state: Vec<bool>, // A bitmap would be more efficient, but nah, we have these resources xD
     logic: Vec<Vec<Option<Gate>>>,
-    sources: Vec<(usize, usize)>,
+    sources: usize,
+    width: usize,
 }
 
 impl Environment {
@@ -25,9 +25,9 @@ impl Environment {
         };
 
         let mut env = Self {
-            state: vec![false; width],
             logic: vec![Vec::new(); height],
-            sources: Vec::new(),
+            sources: 0,
+            width,
         };
 
         for (y, line) in data.lines().filter(|x| !x.is_empty()).enumerate() {
@@ -35,6 +35,7 @@ impl Environment {
             for (x, field) in line.split(" ").filter(|x| !x.is_empty()).enumerate() {
                 if field.contains("Q") {
                     env.logic[y].push(Some(Gate::Source));
+                    env.sources += 1;
                     skip = false;
                 } else if field.contains("L") {
                     env.logic[y].push(Some(Gate::Led));
@@ -48,8 +49,8 @@ impl Environment {
                     skip = true;
                     match field {
                         "" => continue,
-                        "r" => env.logic[y].push(Some(Gate::NotLeft)),
-                        "R" => env.logic[y].push(Some(Gate::NotRight)),
+                        "r" => env.logic[y].push(Some(Gate::NotRight)),
+                        "R" => env.logic[y].push(Some(Gate::NotLeft)),
                         "W" => env.logic[y].push(Some(Gate::Nand)),
                         "B" => env.logic[y].push(Some(Passthrough)),
                         c => {
@@ -61,7 +62,40 @@ impl Environment {
                 }
             }
         }
-
         Ok(env)
     }
+
+    pub fn sources(&self) -> usize {
+        self.sources
+    }
+
+    pub fn simulate(&self, sources: Vec<bool>) -> Result<Vec<bool>> {
+        let mut state = vec![false; self.width];
+
+        let mut source_index = 0usize;
+
+        for row in &self.logic {
+            let mut x = 0usize;
+            for field in row {
+                match field {
+                    Some(g) => match g {
+                        Gate::Source => {
+                            state[x] = sources[source_index];
+                            source_index += 1;
+                        }
+                        Gate::Led => (),
+                        _ => {
+                            (state[x], state[x + 1]) = g.compute(state[x], state[x + 1]);
+                            x += 1;
+                        }
+                    },
+                    None => state[x] = false,
+                }
+                x += 1;
+            }
+            // println!("{:?}", state);
+        }
+
+        Ok(state)
+    }
 }