diff --git a/src/debug.rs b/src/debug.rs
index ce5c33d..0a6ed9b 100644
--- a/src/debug.rs
+++ b/src/debug.rs
@@ -12,6 +12,7 @@ use bevy_editor_pls::EditorPlugin;
 use iyes_progress::prelude::*;
 use strum::IntoEnumIterator;
 
+use crate::simulation::LinesAddedEvent;
 use crate::simulation::Simulation;
 use crate::state::AppState;
 
@@ -128,9 +129,14 @@ impl Plugin for DebugPlugin {
             );
             app.add_systems(
                 Update,
-                |cheat_settings: Res<CheatSettings>, mut simulation: ResMut<Simulation>| {
-                    if cheat_settings.generate_lines {
-                        simulation.lines += 1.0;
+                |mut cheat_settings: ResMut<CheatSettings>,
+                 mut simulation: ResMut<Simulation>,
+                 time: Res<Time>,
+                 mut events: EventWriter<LinesAddedEvent>| {
+                    if cheat_settings.generate_lines
+                        && cheat_settings.timer.tick(time.delta()).just_finished()
+                    {
+                        events.send(LinesAddedEvent { count: 1.0 });
                     }
                 },
             );
@@ -138,9 +144,19 @@ impl Plugin for DebugPlugin {
     }
 }
 
-#[derive(Resource, Default)]
+#[derive(Resource)]
 pub struct CheatSettings {
     pub generate_lines: bool,
+    pub timer: Timer,
+}
+
+impl Default for CheatSettings {
+    fn default() -> Self {
+        Self {
+            generate_lines: false,
+            timer: Timer::from_seconds(0.2, TimerMode::Repeating),
+        }
+    }
 }
 
 const DEBUG_TOGGLE_KEY: KeyCode = KeyCode::F3;
diff --git a/src/simulation.rs b/src/simulation.rs
index 5b638a9..921775a 100644
--- a/src/simulation.rs
+++ b/src/simulation.rs
@@ -56,6 +56,9 @@ pub struct Simulation {
     /// Presentation factor, affects the submissions' results.
     pub presentation_score: f64,
 
+    /// Total lines generated during this playthrough before the costs are subtracted.
+    pub total_lines: f64,
+
     /// Newly added line count will be multiplied by this.
     pub line_multiplier: f64,
 
@@ -87,6 +90,8 @@ impl Default for Simulation {
             fun_score: 0.0,
             presentation_score: 0.0,
 
+            total_lines: 0.0,
+
             line_multiplier: 1.0,
 
             entity_spawn_per_line: 0.0,
@@ -293,6 +298,7 @@ fn handle_line_added_events(
     }
     total *= simulation.line_multiplier;
     simulation.lines += total;
+    simulation.total_lines += total;
 
     // Spawn entities
     let spawned_entities = (total * simulation.entity_spawn_per_line).floor();
diff --git a/src/upgrade.rs b/src/upgrade.rs
index 2d9501f..afc4379 100644
--- a/src/upgrade.rs
+++ b/src/upgrade.rs
@@ -565,13 +565,14 @@ generate_upgrade_list!(
                 mut upgrade_list: ResMut<UpgradeList>,
                 simulation: Res<Simulation>,
             | {
-                upgrade_list[ImportLibrary].value = (simulation.lines * 0.1).max(32.0).floor();
+                upgrade_list[ImportLibrary].value = (simulation.total_lines * 0.1).max(32.0).floor();
             }),
         ),
         install: Some(world.register_system(|
             upgrade_list: Res<UpgradeList>,
             mut simulation: ResMut<Simulation>,
         | {
+            // TODO: Should this stack with specialization skills?
             simulation.lines += upgrade_list[ImportLibrary].value;
         })),
         ..default()