diff --git a/ui/hud.py b/ui/hud.py
index 4877092..a0b31f7 100644
--- a/ui/hud.py
+++ b/ui/hud.py
@@ -152,15 +152,9 @@ class HUD:
         LAYER_VERTICAL_MARGIN = 30  # Top and bottom margin within visualization for neurons
 
         # Connection appearance constants
-        WEIGHT_NORMALIZATION_DIVISOR = 2  # Divisor for normalizing weights to [-1, 1] range
         MAX_CONNECTION_THICKNESS = 4  # Maximum thickness for connection lines
         MIN_CONNECTION_THICKNESS = 1  # Minimum thickness for connection lines
 
-        # Connection colors (RGB values)
-        CONNECTION_BASE_INTENSITY = 128  # Base color intensity for connections
-        CONNECTION_POSITIVE_GREEN = 128  # Green component for positive weights
-        CONNECTION_NEGATIVE_RED = 128  # Red component for negative weights
-
         # Neuron activation colors
         NEURON_BASE_INTENSITY = 100  # Base color intensity for neurons
         NEURON_ACTIVATION_INTENSITY = 155  # Additional intensity based on activation
@@ -359,12 +353,14 @@ class HUD:
                     screen.blit(activation_text, text_rect)
 
         # Draw layer labels
-        layer_labels = ["Input", "Hidden", "Output"]
-        for layer_idx in range(len(network.layers)):
-            if layer_idx >= len(layer_labels):
-                label = f"Layer {layer_idx}"
+        num_layers = len(network.layers)
+        for layer_idx in range(num_layers):
+            if layer_idx == 0:
+                label = "Input"
+            elif layer_idx == num_layers - 1:
+                label = "Output"
             else:
-                label = layer_labels[layer_idx] if layer_idx < len(layer_labels) else f"Hidden {layer_idx - 1}"
+                label = f"Hidden {layer_idx}" if num_layers > 3 else "Hidden"
 
             # Find average x position for this layer
             x_positions = [pos[0] for (l_idx, n_idx), pos in neuron_positions.items() if l_idx == layer_idx]
diff --git a/world/base/brain.py b/world/base/brain.py
index ad4ab23..fadf7fb 100644
--- a/world/base/brain.py
+++ b/world/base/brain.py
@@ -129,7 +129,8 @@ class FlexibleNeuralNetwork:
             (mutated._add_connection, 1.5),  # Moderate - grow connectivity
             (mutated._remove_connection, 0.8),  # Less common - reduce connectivity
             (mutated._add_neuron, 0.3),  # Rare - structural growth
-            (mutated._remove_neuron, 0.1)  # Very rare - structural reduction
+            (mutated._remove_neuron, 0.1),  # Very rare - structural reduction
+            (mutated._add_layer, 0.05),  # New: create a new layer (very rare)
         ]
 
         # Apply weighted random mutations
@@ -339,6 +340,32 @@ class FlexibleNeuralNetwork:
                                 adjusted_connections.append((src_layer, src_neuron, weight))
                         neuron['connections'] = adjusted_connections
 
+    def _add_layer(self):
+        """Add a new hidden layer at a random position with at least one neuron."""
+        if len(self.layers) < 2:
+            return  # Need at least input and output layers
+
+        # Choose a position between input and output layers
+        insert_idx = random.randint(1, len(self.layers) - 1)
+        # Create a new hidden neuron
+        new_neuron = {
+            'type': 'hidden',
+            'id': f'hidden_{random.randint(1000, 9999)}',
+            'bias': random.uniform(-1, 1),
+            'connections': []
+        }
+        # Connect to all neurons in the previous layer
+        for prev_idx in range(len(self.layers[insert_idx - 1])):
+            if random.random() < 0.5:
+                new_neuron['connections'].append((insert_idx - 1, prev_idx, random.uniform(-2, 2)))
+        # Insert the new layer
+        self.layers.insert(insert_idx, [new_neuron])
+        # Connect neurons in the next layer to the new neuron
+        if insert_idx + 1 < len(self.layers):
+            for neuron in self.layers[insert_idx + 1]:
+                if 'connections' in neuron and random.random() < 0.5:
+                    neuron['connections'].append((insert_idx, 0, random.uniform(-2, 2)))
+
     def _ensure_network_connectivity(self):
         """Ensure the network maintains basic connectivity from inputs to outputs."""
         # Check if output neurons have any connections
diff --git a/world/objects.py b/world/objects.py
index 4b93cd2..c6bd3d6 100644
--- a/world/objects.py
+++ b/world/objects.py
@@ -274,7 +274,7 @@ class DefaultCell(BaseEntity):
         :return: Self.
         """
         self.tick_count += 1
-        if self.tick_count % 100 == 0:
+        if self.tick_count % 10 == 0:
             self.behavioral_model = self.behavioral_model.mutate(1)
 
         if interactable is None: