Simple stateless in-game pause mechanism

InGamePause.cs

using UnityEngine;

// @kurtdekker
// Ultra-simple clean stateless in-game pause/unpause mechanism.
// TODO:
//	- put one of these script instances in your running game scene
//	- be sure to set Time.timeScale = 1 when your game starts

public class InGamePause : MonoBehaviour
{
	// anywhere in your game can observe this:
	public static bool IsPaused
	{
		get
		{
			return Time.timeScale == 0;
		}
	}

	void Update ()
	{
		bool pauseUnpauseCommanded = false;

		pauseUnpauseCommanded |= Input.GetKeyDown( KeyCode.Escape);

		//TODO : add any other "input sources" here, have them set the bool pauseUnpauseCommanded

		if (pauseUnpauseCommanded)
		{
			// flip Time.timeScale, which will be our ONLY state
			if (Time.timeScale == 0)
			{
				Time.timeScale = 1;
			}
			else
			{
				Time.timeScale = 0;
			}
		}
	}
}