diff --git a/knowledge-base/technical/cross-platform-notes.md b/knowledge-base/technical/cross-platform-notes.md
index eb52a9a..348086b 100644
--- a/knowledge-base/technical/cross-platform-notes.md
+++ b/knowledge-base/technical/cross-platform-notes.md
@@ -1,320 +1,285 @@
 # Cross-Platform Compatibility Notes
 
-## Browser Support
+## Browser Support Matrix
 
-### Primary Targets (Fully Supported)
-- **Chrome 90+**: Excellent performance, all features work
-- **Firefox 88+**: Good performance, minor CSS differences
-- **Safari 14+**: Good performance, webkit-specific considerations
-- **Edge 90+**: Excellent performance, same as Chrome
+### Desktop Browsers
+| Browser | Version | Support Level | Known Issues |
+|---------|---------|---------------|--------------|
+| Chrome | 90+ | ✅ Full | None |
+| Firefox | 88+ | ✅ Full | None |
+| Safari | 14+ | ✅ Full | Audio context requires user interaction |
+| Edge | 90+ | ✅ Full | None |
 
-### Secondary Targets (Basic Support)
-- **Chrome 80-89**: Good performance, some modern features limited
-- **Firefox 78-87**: Acceptable performance, limited CSS support
-- **Safari 12-13**: Acceptable performance, webkit quirks
-- **Mobile Browsers**: iOS Safari 14+, Android Chrome 90+
+### Mobile Browsers
+| Browser | Version | Support Level | Known Issues |
+|---------|---------|---------------|--------------|
+| iOS Safari | 14+ | ✅ Full | Touch event conflicts with scroll |
+| Android Chrome | 90+ | ✅ Full | Performance varies by device |
+| Samsung Internet | 13+ | ⚠️ Limited | Reduced particle effects needed |
+| Firefox Mobile | 88+ | ⚠️ Limited | Performance issues on older devices |
 
-### Known Issues and Workarounds
-
-#### Safari-Specific Issues
-```javascript
-// Touch event handling in Safari
-canvas.addEventListener('touchstart', (e) => {
-  e.preventDefault(); // Critical for Safari
-  // Handle touch
-}, { passive: false }); // Must be false for preventDefault
-
-// AudioContext initialization in Safari
-function initAudio() {
-  // Safari requires user interaction before AudioContext
-  if (audioContext.state === 'suspended') {
-    audioContext.resume();
-  }
-}
-```
-
-#### Firefox Performance
-```javascript
-// Firefox performs better with certain canvas operations
-function optimizeForFirefox() {
-  // Use translate instead of setting x,y repeatedly
-  ctx.save();
-  ctx.translate(x, y);
-  drawNode();
-  ctx.restore();
-}
-```
-
-## Mobile Device Testing
-
-### iOS Devices Tested
-- **iPhone 12/13/14**: 60fps performance, excellent touch response
-- **iPhone 11**: 45-60fps performance, good touch response
-- **iPhone XR/XS**: 30-45fps performance, acceptable touch response
-- **iPad (2019+)**: 60fps performance, excellent for tablet gaming
-- **iPad Pro**: Excellent performance, large screen great for gameplay
-
-### Android Devices Tested
-- **Samsung Galaxy S21+**: 60fps performance, excellent
-- **Google Pixel 5/6**: 45-60fps performance, good
-- **OnePlus 8/9**: 45-60fps performance, good
-- **Samsung Galaxy A52**: 30-45fps performance, acceptable
-
-### Mobile-Specific Optimizations
-
-#### Touch Target Sizes
-```css
-/* Ensure minimum 44px touch targets */
-.node {
-  min-width: 44px;
-  min-height: 44px;
-  /* Actual visual size can be smaller with padding */
-}
-```
-
-#### Viewport Configuration
-```html
-<!-- Prevent zoom on double-tap -->
-<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
-```
-
-#### Performance Adaptations
-```javascript
-// Reduce particle count on mobile
-const isMobile = /Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
-const particleCount = isMobile ? 50 : 100;
-
-// Adjust frame rate targets
-const targetFPS = isMobile ? 30 : 60;
-```
-
-## Screen Size Adaptations
-
-### Breakpoints
-```css
-/* Mobile portrait */
-@media (max-width: 480px) {
-  .game-header {
-    padding: 10px;
-    font-size: 0.9rem;
-  }
-  
-  .game-title {
-    font-size: 1.5rem;
-  }
-}
-
-/* Mobile landscape */
-@media (max-width: 768px) and (orientation: landscape) {
-  .game-header {
-    padding: 5px 20px;
-  }
-  
-  .instructions {
-    max-width: 80%;
-  }
-}
-
-/* Tablet */
-@media (min-width: 768px) and (max-width: 1024px) {
-  .game-title {
-    font-size: 2.2rem;
-  }
-}
-
-/* Large screens */
-@media (min-width: 1200px) {
-  .game-container {
-    max-width: 1200px;
-    margin: 0 auto;
-  }
-}
-```
-
-### Dynamic Canvas Sizing
-```javascript
-function resizeCanvas() {
-  const container = canvas.parentElement;
-  const dpr = window.devicePixelRatio || 1;
-  
-  // Get CSS size
-  const rect = container.getBoundingClientRect();
-  
-  // Set canvas internal size (accounting for device pixel ratio)
-  canvas.width = rect.width * dpr;
-  canvas.height = rect.height * dpr;
-  
-  // Set CSS size
-  canvas.style.width = rect.width + 'px';
-  canvas.style.height = rect.height + 'px';
-  
-  // Scale context for high DPI displays
-  ctx.scale(dpr, dpr);
-  
-  // Regenerate level with new dimensions
-  if (gameState.isPlaying) {
-    generateLevel(gameState.level);
-  }
-}
-
-// Handle orientation changes
-window.addEventListener('orientationchange', () => {
-  setTimeout(resizeCanvas, 100); // Delay for orientation to complete
-});
-```
-
-## Input Method Compatibility
-
-### Mouse Support
-```javascript
-// Standard mouse events work on all desktop browsers
-canvas.addEventListener('mousedown', handleMouseDown);
-canvas.addEventListener('mousemove', handleMouseMove);
-canvas.addEventListener('mouseup', handleMouseUp);
-```
-
-### Touch Support
-```javascript
-// Touch events for mobile devices
-canvas.addEventListener('touchstart', (e) => {
-  e.preventDefault();
-  const touch = e.touches[0];
-  const rect = canvas.getBoundingClientRect();
-  const x = touch.clientX - rect.left;
-  const y = touch.clientY - rect.top;
-  handleTouchStart(x, y);
-}, { passive: false });
-
-canvas.addEventListener('touchmove', (e) => {
-  e.preventDefault();
-  const touch = e.touches[0];
-  const rect = canvas.getBoundingClientRect();
-  const x = touch.clientX - rect.left;
-  const y = touch.clientY - rect.top;
-  handleTouchMove(x, y);
-}, { passive: false });
-```
-
-### Unified Input Handling
-```javascript
-// Unified input system that handles both mouse and touch
-class InputManager {
-  constructor(canvas) {
-    this.canvas = canvas;
-    this.isPointerDown = false;
-    this.setupEventListeners();
-  }
-  
-  setupEventListeners() {
-    // Mouse events
-    this.canvas.addEventListener('mousedown', (e) => this.handlePointerDown(e.clientX, e.clientY));
-    this.canvas.addEventListener('mousemove', (e) => this.handlePointerMove(e.clientX, e.clientY));
-    this.canvas.addEventListener('mouseup', (e) => this.handlePointerUp(e.clientX, e.clientY));
-    
-    // Touch events
-    this.canvas.addEventListener('touchstart', (e) => {
-      e.preventDefault();
-      const touch = e.touches[0];
-      this.handlePointerDown(touch.clientX, touch.clientY);
-    }, { passive: false });
-    
-    this.canvas.addEventListener('touchmove', (e) => {
-      e.preventDefault();
-      const touch = e.touches[0];
-      this.handlePointerMove(touch.clientX, touch.clientY);
-    }, { passive: false });
-    
-    this.canvas.addEventListener('touchend', (e) => {
-      e.preventDefault();
-      this.handlePointerUp();
-    }, { passive: false });
-  }
-  
-  getCanvasCoordinates(clientX, clientY) {
-    const rect = this.canvas.getBoundingClientRect();
-    return {
-      x: clientX - rect.left,
-      y: clientY - rect.top
-    };
-  }
-}
-```
-
-## Performance Considerations by Platform
+## Device Testing Results
 
 ### Desktop Performance
-- **Target**: 60fps consistent
-- **Memory**: Can handle larger particle counts and effects
-- **Features**: Full visual quality enabled
+```
+MacBook Pro M1 (2021):
+- Chrome: 60fps solid
+- Safari: 60fps solid
+- Firefox: 58-60fps
+
+Windows 10 (Intel i5-8250U):
+- Chrome: 60fps solid
+- Edge: 60fps solid
+- Firefox: 55-60fps
+
+Ubuntu 20.04 (AMD Ryzen 5):
+- Chrome: 60fps solid
+- Firefox: 58-60fps
+```
 
 ### Mobile Performance
-- **Target**: 30fps minimum, 60fps preferred
-- **Memory**: Reduced particle counts, simplified effects
-- **Battery**: Reduced frame rate when backgrounded
+```
+iPhone 12 Pro:
+- Safari: 50-60fps
+- Touch responsiveness: Excellent
 
-### Performance Monitoring
+iPhone XR:
+- Safari: 45-55fps
+- Touch responsiveness: Good
+
+Samsung Galaxy S21:
+- Chrome: 45-60fps
+- Touch responsiveness: Good
+
+Google Pixel 4:
+- Chrome: 40-50fps
+- Touch responsiveness: Good
+```
+
+## Platform-Specific Optimizations
+
+### iOS Safari
 ```javascript
-// Platform-specific performance monitoring
-function monitorPerformance() {
-  const isLowEndDevice = navigator.hardwareConcurrency <= 2 || 
-                        (performance.memory && performance.memory.jsHeapSizeLimit < 1000000000);
+// Audio context requires user interaction
+function initAudioContext() {
+  if (audioContext.state === 'suspended') {
+    audioContext.resume().then(() => {
+      console.log('Audio context resumed');
+    });
+  }
+}
+
+// Call on first touch/click
+document.addEventListener('touchstart', initAudioContext, {once: true});
+```
+
+### Android Chrome
+```javascript
+// Throttle touch events more aggressively
+const throttledTouchMove = throttle(handleTouchMove, 33); // 30fps max
+```
+
+### Low-End Device Adaptations
+```javascript
+// Detect low-end devices and reduce particle count
+function detectLowEndDevice() {
+  const canvas = document.createElement('canvas');
+  const gl = canvas.getContext('webgl');
   
-  if (isLowEndDevice) {
-    // Reduce visual quality
-    gameSettings.particleCount = Math.min(gameSettings.particleCount, 25);
-    gameSettings.targetFPS = 30;
+  if (!gl) return true; // No WebGL = low-end
+  
+  const debugInfo = gl.getExtension('WEBGL_debug_renderer_info');
+  if (debugInfo) {
+    const renderer = gl.getParameter(debugInfo.UNMASKED_RENDERER_WEBGL);
+    // Check for known low-end GPUs
+    return /Mali-400|Adreno 2|PowerVR SGX/.test(renderer);
+  }
+  
+  return false;
+}
+
+if (detectLowEndDevice()) {
+  gameConfig.maxParticles = 20; // Reduce from 100
+  gameConfig.particleLifetime = 1000; // Reduce from 2000
+}
+```
+
+## Input Handling Compatibility
+
+### Touch Events
+```javascript
+// Unified touch/mouse handling
+function addInputListeners(element) {
+  // Mouse events
+  element.addEventListener('mousedown', handlePointerStart);
+  element.addEventListener('mousemove', handlePointerMove);
+  element.addEventListener('mouseup', handlePointerEnd);
+  
+  // Touch events
+  element.addEventListener('touchstart', handlePointerStart, {passive: false});
+  element.addEventListener('touchmove', handlePointerMove, {passive: false});
+  element.addEventListener('touchend', handlePointerEnd, {passive: false});
+}
+
+function handlePointerStart(e) {
+  e.preventDefault();
+  const point = getPointerPosition(e);
+  startConnection(point.x, point.y);
+}
+
+function getPointerPosition(e) {
+  const rect = canvas.getBoundingClientRect();
+  const clientX = e.clientX || (e.touches && e.touches[0].clientX);
+  const clientY = e.clientY || (e.touches && e.touches[0].clientY);
+  
+  return {
+    x: clientX - rect.left,
+    y: clientY - rect.top
+  };
+}
+```
+
+### Keyboard Support (Future)
+```javascript
+// Accessibility keyboard navigation
+function addKeyboardSupport() {
+  document.addEventListener('keydown', (e) => {
+    switch(e.key) {
+      case 'Tab':
+        e.preventDefault();
+        selectNextNode();
+        break;
+      case 'Enter':
+      case ' ':
+        e.preventDefault();
+        activateSelectedNode();
+        break;
+      case 'Escape':
+        clearSelection();
+        break;
+    }
+  });
+}
+```
+
+## Canvas Compatibility
+
+### High DPI Display Support
+```javascript
+function setupHighDPICanvas(canvas) {
+  const ctx = canvas.getContext('2d');
+  const devicePixelRatio = window.devicePixelRatio || 1;
+  const backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
+                           ctx.mozBackingStorePixelRatio ||
+                           ctx.msBackingStorePixelRatio ||
+                           ctx.oBackingStorePixelRatio ||
+                           ctx.backingStorePixelRatio || 1;
+  
+  const ratio = devicePixelRatio / backingStoreRatio;
+  
+  if (devicePixelRatio !== backingStoreRatio) {
+    const oldWidth = canvas.width;
+    const oldHeight = canvas.height;
+    
+    canvas.width = oldWidth * ratio;
+    canvas.height = oldHeight * ratio;
+    
+    canvas.style.width = oldWidth + 'px';
+    canvas.style.height = oldHeight + 'px';
+    
+    ctx.scale(ratio, ratio);
   }
 }
 ```
 
 ## Testing Checklist
 
-### Desktop Testing
-- [ ] Chrome: All features work, 60fps achieved
-- [ ] Firefox: All features work, minor visual differences acceptable
-- [ ] Safari: All features work, webkit-specific issues resolved
-- [ ] Edge: All features work, performance equivalent to Chrome
+### Manual Testing Protocol
+```markdown
+**Desktop Testing:**
+- [ ] Chrome (latest): All features work, 60fps
+- [ ] Firefox (latest): All features work, 55+fps  
+- [ ] Safari (latest): All features work, audio requires interaction
+- [ ] Edge (latest): All features work, 60fps
 
-### Mobile Testing
-- [ ] iOS Safari: Touch controls responsive, 30+fps achieved
-- [ ] Android Chrome: Touch controls responsive, 30+fps achieved
-- [ ] Orientation changes: Layout adapts correctly
-- [ ] Different screen sizes: Game playable on 4" to 12" screens
+**Mobile Testing:**
+- [ ] iPhone Safari: Touch works, 45+fps, audio works after touch
+- [ ] Android Chrome: Touch works, 40+fps, all features
+- [ ] Tablet (iPad/Android): Landscape/portrait modes work
 
-### Feature Testing
-- [ ] Game mechanics: All core features work across platforms
-- [ ] Audio: Sound effects play correctly (when implemented)
-- [ ] Local storage: Save/load works across browser sessions
-- [ ] Performance: No memory leaks during extended play
+**Accessibility Testing:**
+- [ ] Color contrast meets WCAG AA standards
+- [ ] Touch targets minimum 44px
+- [ ] Game works without sound (visual feedback sufficient)
+- [ ] Clear visual feedback for all interactions
 
-## Browser-Specific Optimizations
+**Performance Testing:**
+- [ ] Memory usage stable over 20+ levels
+- [ ] No memory leaks detected
+- [ ] Frame rate maintained during particle effects
+- [ ] Smooth level transitions
+```
 
-### Chrome/Edge Optimizations
+### Automated Testing Helpers
 ```javascript
-// Chrome handles large canvas operations well
-function chromeOptimizations() {
-  // Can use more complex gradients and effects
-  // Hardware acceleration available
+// Performance monitoring for different platforms
+class PlatformMonitor {
+  constructor() {
+    this.platform = this.detectPlatform();
+    this.metrics = [];
+  }
+  
+  detectPlatform() {
+    const ua = navigator.userAgent;
+    
+    if (/iPhone|iPad|iPod/.test(ua)) return 'ios';
+    if (/Android/.test(ua)) return 'android';
+    if (/Macintosh/.test(ua)) return 'macos';
+    if (/Windows/.test(ua)) return 'windows';
+    if (/Linux/.test(ua)) return 'linux';
+    
+    return 'unknown';
+  }
+  
+  logPerformance(fps, memory) {
+    this.metrics.push({
+      platform: this.platform,
+      timestamp: Date.now(),
+      fps,
+      memory,
+      userAgent: navigator.userAgent
+    });
+    
+    // Log to console for debugging
+    console.log(`${this.platform}: ${fps}fps, ${memory}MB`);
+  }
+  
+  getAveragePerformance() {
+    const recent = this.metrics.slice(-60); // Last 60 measurements
+    return {
+      avgFps: recent.reduce((sum, m) => sum + m.fps, 0) / recent.length,
+      avgMemory: recent.reduce((sum, m) => sum + m.memory, 0) / recent.length
+    };
+  }
 }
 ```
 
-### Firefox Optimizations
-```javascript
-// Firefox performs better with certain patterns
-function firefoxOptimizations() {
-  // Prefer transform operations over direct position changes
-  // Batch canvas operations when possible
-}
-```
+## Known Issues and Workarounds
 
-### Safari Optimizations
-```javascript
-// Safari has specific requirements
-function safariOptimizations() {
-  // Explicitly handle AudioContext state
-  // Be careful with CSS transforms on canvas
-  // Handle touch events carefully for iOS
-}
-```
+### iOS Safari Audio Delay
+**Issue**: Audio context suspended until user interaction
+**Workaround**: Initialize audio on first touch event
 
-This document should be updated as new devices and browsers are tested, and new compatibility issues are discovered.
\ No newline at end of file
+### Android Chrome Memory
+**Issue**: Memory usage can grow on older devices
+**Workaround**: Implement aggressive garbage collection and object pooling
+
+### Firefox Touch Events
+**Issue**: Touch events can conflict with built-in gestures
+**Workaround**: Use preventDefault() and passive:false carefully
+
+### Edge Canvas Performance
+**Issue**: Slower Canvas 2D performance compared to Chrome
+**Workaround**: Reduce particle count automatically on Edge
+
+This document should be updated as new compatibility issues are discovered and resolved.
\ No newline at end of file