Refactored code and a more fun text interface. WIZARD!

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NumberWizard : MonoBehaviour
{
    int maxNumToGuess = 1000;
    int minNumToGuess = 1;
    int guess = 500;

	void Start ()
    {
        Debug.Log("You know what Wizards are good at? GUESSING NUMBERS! True story.");
        Debug.Log("I'm the Number Wizard. Pick a number, I'll try and guess what it is!");
        Debug.Log("The highest number you can pick is: " + maxNumToGuess + ".");
        Debug.Log("The lowest number you can pick is: " + minNumToGuess + ".");
        Debug.Log("Tell me if your number is higher or lower than 500.");
        Debug.Log("Press UP ARROW if higher, Press DOWN ARROW if lower, Press ENTER if correct.");

        maxNumToGuess += 1;
	}
	
	void Update ()
    {
        if (Input.GetKeyDown(KeyCode.UpArrow))
        {
            Debug.Log("You told me your number was higher...");
            minNumToGuess = guess;
            guess = NewGuess();
        }
        else if (Input.GetKeyDown(KeyCode.DownArrow))
        {
            Debug.Log("You told me your number was lower...");
            maxNumToGuess = guess;
            guess = NewGuess();
        }
        else if (Input.GetKeyDown(KeyCode.KeypadEnter) || Input.GetKeyDown(KeyCode.Return))
        {
            Debug.Log("Hey look I guessed your number. WIZARD!");
            Debug.Log("Your number was: " + guess + ".");
        }
    }

    public int NewGuess()
    {
        int newGuess = (maxNumToGuess + minNumToGuess) / 2;
        Debug.Log("Let me guess again ... what about: " + newGuess + "?");
        return newGuess;
    }
}

/* Known bug, if the user incorrectly gives the correct input for their guess, the guess will eventually get stuck on a single number when the minimum guess and maximum guess become equal to one another. */

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