Modern games rely heavily on structured progression systems:

• Main story quests
• Side quests
• Dynamic missions
• Dialogue trees
• NPC interactions
• World state & flags
• Branching narrative
• Story checkpoints
• Rewards

Lua is ideal for this:

• Data-driven quest definitions
• Easy branching logic
• Hot reload for dialogue systems
• Clean JSON-like scripting
• Integrates perfectly with triggers, inventory, UI, and levels

This chapter introduces a complete quest system used in RPGs, action games, and open-world titles.