diff --git a/src/editor.rs b/src/editor.rs
index 92e10bb..18a4510 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -56,8 +56,7 @@ pub struct Editor {
 	time_since_step: f32,
 	exit_state: ExitState,
 	exit_menu: bool,
-	complete_popup: Popup,
-	// fail_popup: Popup,
+	popup: EndPopup,
 	score: Option<Score>,
 	blueprints: Vec<Blueprint>,
 	selected_blueprint: usize,
@@ -69,9 +68,10 @@ pub struct Editor {
 }
 
 #[derive(Debug, PartialEq)]
-enum Popup {
-	Start,
-	Visible,
+enum EndPopup {
+	None,
+	Success,
+	Failure,
 	Dismissed,
 }
 
@@ -135,8 +135,7 @@ impl Editor {
 			level,
 			exit_state: ExitState::Dont,
 			exit_menu: false,
-			complete_popup: Popup::Start,
-			// fail_popup: Popup::Start,
+			popup: EndPopup::None,
 			score: solution.score,
 			blueprints: get_blueprints(),
 			selected_blueprint: usize::MAX,
@@ -190,21 +189,25 @@ impl Editor {
 	fn step(&mut self) {
 		self.machine.step();
 
-		if self.complete_popup == Popup::Visible {
-			self.complete_popup = Popup::Dismissed;
+		if self.popup != EndPopup::None {
+			self.popup = EndPopup::Dismissed;
 		}
 		if !self.level.outputs().is_empty()
-			&& self.level.outputs() == self.machine.output()
-			&& self.complete_popup == Popup::Start
+			&& self.popup == EndPopup::None
 		{
-			self.complete_popup = Popup::Visible;
-			println!("completed in {:?}", self.start_time.elapsed());
-			self.exit_state = ExitState::Save;
-			self.sim_state = SimState::Stepping;
-			self.score = Some(Score {
-				cycles: self.machine.step_count(),
-				tiles: self.source_board.count_tiles(),
-			});
+			if self.level.outputs() == self.machine.output() {
+				self.popup = EndPopup::Success;
+				println!("completed in {:?}", self.start_time.elapsed());
+				self.exit_state = ExitState::Save;
+				self.sim_state = SimState::Stepping;
+				self.score = Some(Score {
+					cycles: self.machine.step_count(),
+					tiles: self.source_board.count_tiles(),
+				});
+			} else if !self.level.outputs().starts_with(self.machine.output()) {
+				self.popup = EndPopup::Failure;
+				self.sim_state = SimState::Stepping;
+			}
 		}
 	}
 
@@ -332,7 +335,7 @@ impl Editor {
 	pub fn update(&mut self, rl: &RaylibHandle) {
 		if rl.is_key_pressed(KeyboardKey::KEY_ESCAPE) {
 			self.sim_state = SimState::Editing;
-			self.complete_popup = Popup::Start;
+			self.popup = EndPopup::None;
 		}
 		if self.sim_state == SimState::Running {
 			self.time_since_step += rl.get_frame_time();
@@ -373,7 +376,7 @@ impl Editor {
 				}
 				SimState::Running => {
 					self.sim_state = SimState::Editing;
-					self.complete_popup = Popup::Start;
+					self.popup = EndPopup::None;
 				}
 				SimState::Stepping => self.sim_state = SimState::Running,
 			}
@@ -510,7 +513,7 @@ impl Editor {
 			}
 		}
 
-		if self.complete_popup == Popup::Visible {
+		if self.popup == EndPopup::Success {
 			let width = 320;
 			let height = 165;
 			let x = d.get_screen_width() / 2 - width / 2;
@@ -524,7 +527,7 @@ impl Editor {
 				draw_usize(d, textures, score.tiles, x + 210, y + 70, 5, 2);
 			}
 			if simple_button(d, x + 10, y + 110, 140, 45) {
-				self.complete_popup = Popup::Dismissed;
+				self.popup = EndPopup::Dismissed;
 			}
 			d.draw_text("continue\nediting", x + 15, y + 115, 20, Color::WHITE);
 
@@ -539,6 +542,20 @@ impl Editor {
 				Color::WHITE,
 			);
 		}
+
+		if self.popup == EndPopup::Failure {
+			let width = 320;
+			let height = 165;
+			let x = d.get_screen_width() / 2 - width / 2;
+			let y = d.get_screen_height() / 2 - height / 2;
+			d.draw_rectangle(x, y, width, height, BG_DARK);
+			d.draw_text("Level Failed!", x + 45, y + 10, 30, Color::RED);
+			d.draw_text("incorrect output", x + 45, y + 45, 20, Color::WHITE);
+			if simple_button(d, x + 10, y + 110, 300, 25) {
+				self.popup = EndPopup::Dismissed;
+			}
+			d.draw_text("ok :(", x + 15, y + 115, 20, Color::WHITE);
+		}
 	}
 
 	fn draw_top_bar(&mut self, d: &mut RaylibDrawHandle, textures: &Textures) {
@@ -590,7 +607,7 @@ impl Editor {
 				draw_scaled_texture(d, textures.get("pause"), 260, 4, 2.);
 				if simple_button(d, 296, 4, 32, 32) {
 					self.sim_state = SimState::Editing;
-					self.complete_popup = Popup::Start;
+					self.popup = EndPopup::None;
 				}
 				draw_scaled_texture(d, textures.get("stop"), 296, 4, 2.);
 			}
@@ -601,7 +618,7 @@ impl Editor {
 				draw_scaled_texture(d, textures.get("play"), 260, 4, 2.);
 				if simple_button(d, 296, 4, 32, 32) {
 					self.sim_state = SimState::Editing;
-					self.complete_popup = Popup::Start;
+					self.popup = EndPopup::None;
 				}
 				draw_scaled_texture(d, textures.get("stop"), 296, 4, 2.);
 			}