All features are in place. Here's what was added:

**Navigation Controls:**
- **Arrow buttons** (< ● >) at the bottom to cycle through interactive objects and tap to interact
- **Keyboard shortcuts**: Left/Right arrows or A/D to navigate objects, Enter/Space/E to interact
- **Hover tooltips** showing object names when you mouse over them
- **Focus highlighting** with animated dashed border on the selected object

**Help System:**
- **"? Hint" button** at top center gives context-sensitive hints based on your progress
- **H key** triggers the same contextual hint
- **Tab key** toggles labels on all interactive objects at once

**Progress Tracker:**
- **4 dots** at top-right showing puzzle completion progress (fills red as you solve each step)

**Combo Lock Keyboard Support:**
- **Arrow keys** navigate and adjust combo digits (Left/Right to switch, Up/Down to change value)
- **Enter** to submit, **Escape** to cancel
- **Message boxes** dismissable with Enter/Space/Escape

**Inventory Shortcuts:**
- **Number keys 1-5** to select/deselect inventory items

**Next Ideas:**
1. **Room Zoom** - Add pinch-to-zoom or click-to-zoom on objects for closer inspection and hidden detail discovery
2. **Animated Transitions** - Add smooth camera pan animations when navigating between objects for a more immersive feel

**Ready to level up your game? Pick one and let's build it!**