CheatCode.cs

using UnityEngine;
using System.Collections;
using UnityEngine.Events;

public class CheatCode : MonoBehaviour
{

	public string code;
	public UnityEvent onCodeEntered;
	protected int current;

	void Update()
	{
		if (Input.anyKeyDown) {
			if (Input.GetKeyDown(code [current].ToString())) {
				current++;
				
				if (current >= code.Length) {
					current = 0;
					onCodeEntered.Invoke();
				}
				
			} else {
				current = 0;
			}
		}
	}
}