Typical use cases

• Simple deterministic AI behavior

  Indie games with small number of AI agent states, usually platformers or fast-paced games like shooters or bullet hells - in general games that doesn't need long-term or strategic planning and they have to make decision fast to adapt to quickly changed environment.

• Animations

  All modern game engines use FSM to manage animations, transition between them also contains information about blending between states to not make states snap from one to another instantly.

• Game states / game modes

  Imagine you have a game session with several states: Overworld, Battle, Shop, Crafting. You might use FSM to manage changes between these different game modes.