diff --git a/src/main.rs b/src/main.rs
index de7f6de..13f41fa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 mod asteroids;
 mod nn;
 mod player;
+mod population;
 mod world;
 
 use macroquad::prelude::*;
@@ -15,11 +16,8 @@ async fn main() {
         ..Default::default()
     };
     set_camera(&cam);
-    let mut world = World::new();
+    // let mut world = World::new();
     let mut nn = NN::new(vec![1, 2, 1]);
-    println!("{} {}", nn.weights[0], nn.weights[1]);
-    nn.mutation();
-    println!("{} {}", nn.weights[0], nn.weights[1]);
 
     loop {
         // clear_background(BLACK);
diff --git a/src/nn.rs b/src/nn.rs
index f602dff..9159e28 100644
--- a/src/nn.rs
+++ b/src/nn.rs
@@ -11,7 +11,7 @@ enum ActivationFunc {
 }
 pub struct NN {
     config: Vec<usize>,
-    pub weights: Vec<DMatrix<f32>>,
+    weights: Vec<DMatrix<f32>>,
     activ_func: ActivationFunc,
     mut_rate: f32,
 }
diff --git a/src/player.rs b/src/player.rs
index 3e994c4..b4dbabe 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -2,7 +2,7 @@ use std::{f32::consts::PI, path::Iter};
 
 use macroquad::{prelude::*, rand::gen_range};
 
-use crate::asteroids::Asteroid;
+use crate::{asteroids::Asteroid, nn::NN};
 #[derive(Default)]
 pub struct Player {
     pos: Vec2,
@@ -13,6 +13,7 @@ pub struct Player {
     bullets: Vec<Bullet>,
     last_shot: f32,
     shot_interval: f32,
+    brain: Option<NN>,
     alive: bool,
 }
 
@@ -28,6 +29,12 @@ impl Player {
         }
     }
 
+    pub fn simulate(brain: NN) -> Self {
+        let mut p = Player::new();
+        p.brain = Some(brain);
+        p
+    }
+
     pub fn check_player_collision(&mut self, asteroid: &mut Asteroid) -> bool {
         if asteroid.check_collision(self.pos, 8.) {
             self.alive = false;
diff --git a/src/population.rs b/src/population.rs
new file mode 100644
index 0000000..a04425c
--- /dev/null
+++ b/src/population.rs
@@ -0,0 +1,18 @@
+use crate::world::World;
+
+#[derive(Default)]
+struct Population {
+    size: i32,
+    gen: i32,
+    worlds: Vec<World>,
+}
+
+impl Population {
+    // pub fn new(size: i32) -> Self {
+    //     Self {
+    //         size: size,
+    //         worlds: vec![World::new(); size],
+    //         ..Default::default(),
+    //     }
+    // }
+}
diff --git a/src/world.rs b/src/world.rs
index 9c08c13..dd06ddc 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -1,5 +1,6 @@
 use crate::{
     asteroids::{Asteroid, AsteroidSize},
+    nn::NN,
     player::Player,
 };
 use macroquad::{prelude::*, rand::gen_range};
@@ -20,6 +21,13 @@ impl World {
         }
     }
 
+    pub fn simulate(brain: NN) -> Self {
+        Self {
+            player: Player::simulate(brain),
+            ..Default::default()
+        }
+    }
+
     pub fn update(&mut self) {
         self.player.update();
         let mut to_add: Vec<Asteroid> = Vec::new();