Build HIERARCHICAL State Machines FAST and EASY in Unity

Hierarchical State Machines (HSMs) offer a powerful way to structure complex game logic by organizing states into nested layers of behavior. In this video, we build a fully functional HSM system in Unity from the ground up, starting with core concepts like state activation and transitions, then layering in a robust transition sequencer that acts as a mini-orchestrator for running activities during entry and exit. Along the way, we implement features like asynchronous delays, sequential and parallel phases, and show how to keep your state logic composable and testable. This is an advanced, code-intensive walkthrough designed for developers who want precision control over game state and transition flow.

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▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬

0:00 Hierarchical State Machine Overview
1:30 State, Statemachine and Sequencer
8:00 PlayerStateDriver
11:07 StateMachineBuilder
12:55 Concrete States
18:12 Basic Sequencer
23:47 Activities
26:24 Sequential vs Parallel

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