- **event** - Event system for game logic
- **vector2d** - 2D vector math
- **bullet** - Physics engine integration
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**Sections:**
- 18.1 event - Event System
- 18.2 vector2d - 2D Math
- 18.3 bullet - Physics Engine
- 18.4 Example: Building a Simple Game
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**Previous:** Chapter 17: OpenGL Graphics
**Next:** Chapter 19: Terminal UI