diff --git a/Cargo.lock b/Cargo.lock
index ee4f5e6..7621658 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1319,6 +1319,7 @@ dependencies = [
  "bevy_egui",
  "noise",
  "paste",
+ "rand 0.8.5",
  "serde",
 ]
 
diff --git a/crates/border-wars/Cargo.toml b/crates/border-wars/Cargo.toml
index fabf283..68e7ebf 100644
--- a/crates/border-wars/Cargo.toml
+++ b/crates/border-wars/Cargo.toml
@@ -17,3 +17,4 @@ noise = "0.8.2"
 paste = "1.0.14"
 bevnet = { path = "../bevnet" }
 serde = "1.0.197"
+rand = "0.8.5"
diff --git a/crates/border-wars/src/scenes/lobby.rs b/crates/border-wars/src/scenes/lobby.rs
index 1bbbfa5..ffdbb2b 100644
--- a/crates/border-wars/src/scenes/lobby.rs
+++ b/crates/border-wars/src/scenes/lobby.rs
@@ -3,6 +3,7 @@
 use bevnet::{Connection, SendTo};
 use bevy::prelude::*;
 use bevy_egui::{egui, EguiContexts};
+use rand::Rng;
 
 use crate::map::generation::StartMapGeneration;
 use crate::networking::connection::RemovePlayer;
@@ -70,24 +71,26 @@ fn lobby_ui(
 
         ui.add(egui::Slider::new(&mut (*map_size), 0..=5).text("map size"));
 
-        if ui.button("Run the game").clicked() {
-            for player in all_players_query.iter() {
-                start_game_event.send(SendTo(
-                    player.uuid,
-                    StartGame(StartMapGeneration {
-                        seed: 0,
-                        radius: get_map_sizes(all_players_query.iter().count() as u64)
-                            [*map_size as usize] as u16
-                            * 2,
-                    }),
-                ));
-            }
+        if !ui.button("Run the game").clicked() {
+            return;
+        }
+
+        let seed = rand::thread_rng().gen::<u32>();
+        let radius =
+            get_map_sizes(all_players_query.iter().count() as u32)[*map_size as usize] as u16;
+
+        // Start the game.
+        for player in all_players_query.iter() {
+            start_game_event.send(SendTo(
+                player.uuid,
+                StartGame(StartMapGeneration { seed, radius }),
+            ));
         }
     });
 }
 
 /// Get the map sizes form a given number of players.
-fn get_map_sizes(number_of_players: u64) -> Vec<u64> {
+fn get_map_sizes(number_of_players: u32) -> Vec<u32> {
     let mut result = Vec::with_capacity(6);
 
     let mut current = 0;