🎵 Add sound effects and challenge mode

- Web Audio API sound effects for achievements and improvements
- Keyboard shortcuts (Space to start, Ctrl+S to share, M to mute)
- Challenge mode with Gold/Silver/Bronze targets
- Pro tips section for better user engagement
- Ascending arpeggio for achievements
- Gentle ping for fitness improvements
- MutationObserver to detect and play sounds automatically

app.py

@@ -569,6 +569,82 @@ with gr.Blocks(
     # Aurora effect at the top
     gr.HTML(AURORA_HTML)
     
+    # Sound effects (Web Audio API)
+    gr.HTML('''
+    <script>
+    // Sound system for achievements and improvements
+    const audioContext = new (window.AudioContext || window.webkitAudioContext)();
+    let soundEnabled = true;
+    
+    function playSound(type) {
+        if (!soundEnabled) return;
+        
+        const oscillator = audioContext.createOscillator();
+        const gainNode = audioContext.createGain();
+        
+        oscillator.connect(gainNode);
+        gainNode.connect(audioContext.destination);
+        
+        if (type === 'achievement') {
+            // Achievement sound - ascending arpeggio
+            oscillator.frequency.setValueAtTime(523.25, audioContext.currentTime); // C5
+            oscillator.frequency.setValueAtTime(659.25, audioContext.currentTime + 0.1); // E5
+            oscillator.frequency.setValueAtTime(783.99, audioContext.currentTime + 0.2); // G5
+            oscillator.frequency.setValueAtTime(1046.50, audioContext.currentTime + 0.3); // C6
+            gainNode.gain.setValueAtTime(0.3, audioContext.currentTime);
+            gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + 0.5);
+            oscillator.start();
+            oscillator.stop(audioContext.currentTime + 0.5);
+        } else if (type === 'improvement') {
+            // Improvement sound - gentle ping
+            oscillator.frequency.setValueAtTime(880, audioContext.currentTime); // A5
+            gainNode.gain.setValueAtTime(0.1, audioContext.currentTime);
+            gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + 0.2);
+            oscillator.start();
+            oscillator.stop(audioContext.currentTime + 0.2);
+        }
+    }
+    
+    // Watch for achievement messages
+    const observeAchievements = new MutationObserver((mutations) => {
+        mutations.forEach((mutation) => {
+            if (mutation.type === 'childList') {
+                const text = mutation.target.textContent || '';
+                if (text.includes('ACHIEVEMENT UNLOCKED')) {
+                    playSound('achievement');
+                } else if (text.includes('✨') && text.includes('+0.0')) {
+                    playSound('improvement');
+                }
+            }
+        });
+    });
+    
+    // Start observing when ready
+    setTimeout(() => {
+        const eventLog = document.querySelector('[id*="event_log"]');
+        if (eventLog) {
+            observeAchievements.observe(eventLog, { childList: true, subtree: true });
+        }
+    }, 1000);
+    
+    // Keyboard shortcuts
+    document.addEventListener('keydown', (e) => {
+        if (e.key === ' ' && e.target.tagName !== 'INPUT') {
+            e.preventDefault();
+            const startBtn = document.querySelector('.gr-button-primary');
+            if (startBtn) startBtn.click();
+        } else if (e.key === 's' && e.ctrlKey) {
+            e.preventDefault();
+            const shareBtn = document.querySelector('[id*="share_btn"]');
+            if (shareBtn) shareBtn.click();
+        } else if (e.key === 'm') {
+            soundEnabled = !soundEnabled;
+            console.log('Sound', soundEnabled ? 'enabled' : 'disabled');
+        }
+    });
+    </script>
+    ''')
+    
     with gr.Row():
         with gr.Column(scale=1):
             toggle_btn = gr.Button("🚀 Start Evolution", variant="primary", size="lg")
@@ -678,6 +754,27 @@ with gr.Blocks(
         outputs=[fitness_display, generation_display, variants_display, speed_display, fitness_chart, landscape_3d, code_display, achievements_display, event_log]
     )
     
+    # Challenge Mode
+    with gr.Row():
+        gr.Markdown("""
+        ### 🎯 Challenge Mode
+        
+        **Today's Challenge**: Reach 99% fitness in under 10 generations!
+        
+        🥇 **Gold**: < 5 generations  
+        🥈 **Silver**: < 7 generations  
+        🥉 **Bronze**: < 10 generations
+        """)
+        
+        gr.HTML('''
+        <div style="text-align: center; padding: 20px;">
+            <div style="display: inline-block; background: linear-gradient(45deg, #FFD700, #FFA500); padding: 15px 30px; border-radius: 10px;">
+                <h3 style="margin: 0; color: #000;">🏅 Your Best: Not Set</h3>
+                <p style="margin: 5px 0 0 0; color: #333;">Complete a run to set your record!</p>
+            </div>
+        </div>
+        ''')
+    
     gr.Markdown("""
     ---
     ### 🏆 HuggingFace Agents-MCP Hackathon 2025
@@ -686,6 +783,19 @@ with gr.Blocks(
     
     This demo showcases AI-driven code evolution with real-time visualization. The aurora effects 
     intensify with fitness improvements, creating a stunning visual representation of machine learning.
+    
+    ### ⌨️ Keyboard Shortcuts
+    
+    - **Space**: Start/Stop Evolution
+    - **Ctrl+S**: Share Your Score
+    - **M**: Toggle Sound Effects
+    
+    ### 💡 Pro Tips
+    
+    - Watch for achievement unlocks - they come with special sound effects!
+    - The aurora intensifies with larger fitness improvements
+    - Modal's parallel execution evaluates 4-8 variants simultaneously
+    - Try to unlock all 5 achievements in a single run!
     """)
 
 if __name__ == "__main__":