diff --git a/petri/src/lib.rs b/petri/src/lib.rs
index a1ddf42..66521e1 100644
--- a/petri/src/lib.rs
+++ b/petri/src/lib.rs
@@ -20,7 +20,7 @@ pub struct Chunk {
 pub struct Rule {
 	pub from: RulePattern,
 	pub to: RulePattern,
-	pub enabled: bool,
+	// enabled: bool
 	// probability: u8
 	// flip:
 	// rotate:
@@ -29,7 +29,6 @@ pub struct Rule {
 impl Rule {
 	pub fn new() -> Self {
 		Self {
-			enabled: false,
 			from: RulePattern::new(),
 			to: RulePattern::new(),
 		}
@@ -73,7 +72,6 @@ impl Dish {
 
 			rules: vec![
 				Rule {
-					enabled: true,
 					from: RulePattern {
 						width: 1,
 						height: 2,
@@ -86,7 +84,6 @@ impl Dish {
 					},
 				},
 				Rule {
-					enabled: true,
 					from: RulePattern {
 						width: 2,
 						height: 2,
@@ -99,7 +96,6 @@ impl Dish {
 					},
 				},
 				Rule {
-					enabled: true,
 					from: RulePattern {
 						width: 2,
 						height: 2,
@@ -116,22 +112,10 @@ impl Dish {
 	}
 
 	pub fn fire_blindly(&mut self) {
-		if self.rules.is_empty() {
-			return;
-		}
+		assert!(!self.rules.is_empty());
 		let x = random::<usize>() % CHUNK_SIZE;
 		let y = random::<usize>() % CHUNK_SIZE;
-		let enabled_rules = self
-			.rules
-			.iter()
-			.enumerate()
-			.filter_map(|(i, r)| r.enabled.then_some(i))
-			.collect::<Vec<_>>();
-		if enabled_rules.is_empty() {
-			return;
-		}
-		let rule = random::<usize>() % enabled_rules.len();
-		let rule = enabled_rules[rule];
+		let rule = random::<usize>() % self.rules.len();
 		self.fire_rule(rule, x, y);
 	}
 
diff --git a/uscope/src/main.rs b/uscope/src/main.rs
index 48e462f..a71cb9d 100644
--- a/uscope/src/main.rs
+++ b/uscope/src/main.rs
@@ -33,7 +33,7 @@ impl UScope {
 	fn new(_cc: &eframe::CreationContext<'_>) -> Self {
 		Self {
 			dish: Dish::new(),
-			speed: 250,
+			speed: 100,
 			brush: Cell(1),
 			celltypes: vec![
 				CellData::new("air", 0, 0, 0),
@@ -51,10 +51,7 @@ impl eframe::App for UScope {
 		}
 		SidePanel::left("left_panel").show(ctx, |ui| {
 			ui.heading("Simulation");
-			ui.label("speed");
 			ui.add(Slider::new(&mut self.speed, 0..=5000));
-			ui.separator();
-
 			ui.heading("Cells");
 			for (i, cell) in self.celltypes.iter_mut().enumerate() {
 				ui.horizontal(|ui| {
@@ -64,7 +61,6 @@ impl eframe::App for UScope {
 					ui.color_edit_button_srgba(&mut cell.color);
 				});
 			}
-
 			if ui.button("add cell").clicked() {
 				let h = random::<f32>();
 				let s = random::<f32>() * 0.5 + 0.5;
@@ -73,19 +69,9 @@ impl eframe::App for UScope {
 				let name = format!("cell #{}", self.celltypes.len());
 				self.celltypes.push(CellData { name, color })
 			}
-			ui.separator();
-
 			ui.heading("Rules");
-			let mut to_remove = None;
-			for (i, rule) in self.dish.rules.iter_mut().enumerate() {
+			for rule in &mut self.dish.rules {
 				rule_editor(ui, rule, &self.celltypes);
-				if ui.button("delete").clicked() {
-					to_remove = Some(i);
-				}
-				ui.separator();
-			}
-			if let Some(i) = to_remove {
-				self.dish.rules.remove(i);
 			}
 			if ui.button("add rule").clicked() {
 				self.dish.rules.push(Rule::new());
@@ -122,10 +108,8 @@ fn paint_chunk(painter: Painter, chunk: &Chunk, cells: &[CellData]) {
 }
 
 const CSIZE: f32 = 24.;
-const OUTLINE: (f32, Color32) = (3., Color32::GRAY);
+const OUTLINE: (f32, Color32) = (1., Color32::GRAY);
 fn rule_editor(ui: &mut Ui, rule: &mut Rule, cells: &[CellData]) {
-	ui.checkbox(&mut rule.enabled, "enable rule");
-
 	let cells_y = rule.from.height();
 	let cells_x = rule.from.width();
 	let margin = 8.;