How to make a simple scoring system with multiple triggers?

Questions & Answers
1

I’m very new to Unity, and game dev in general, so if possible, talk to me like I’m two?

I’m creating a simple game where there are four coloured balls and four coloured holes. The objective is to get the balls into the corresponding holes.

Here’s what I want the scoring system to be like:
Get a ball into the right hole: +1
Get a ball into the wrong hole: -1

I have one script for each trigger, they all look the same (besides for the name of the colours) but this is the one for the green trigger:

void Start ()
{
	Count = 0;
	Score.text = "Score: " + Count.ToString ();
}

void OnTriggerEnter(Collider other)
{
	if (other.gameObject.CompareTag ("Green"))
	{
	     Count = Count + 1;
	     Score.text = "Score: " + Count.ToString ();
         other.gameObject.SetActive (false);
	}

	if (other.gameObject.CompareTag ("Blue"))
	{
		Count = Count - 1;
	    Score.text = "Score: " + Count.ToString ();
		other.gameObject.SetActive (false);
	}

	if (other.gameObject.CompareTag ("Red"))
	{
		Count = Count - 1;
	    Score.text = "Score: " + Count.ToString ();
		other.gameObject.SetActive (false);
	}

	if (other.gameObject.CompareTag ("Yellow"))
	{
		Count = Count - 1;
	    Score.text = "Score: " + Count.ToString ();
		other.gameObject.SetActive (false);
	}
 }

Expected behavior: The score gets increased when I get a ball into the right hole, and decreased when getting one into the wrong hole, making the maximum score 4, and minimum -4.

Examined behavior: It works fine for the first ball, but then things start to get weird. If I get the first ball right, the score wont increase anymore (it will stay at 1). Same goes for getting one in the wrong hole (it will stay at -1).

Note: I’e also tried adding another ball to see how it would behave if I got two of the same coloured balls in the right hole. This seemed to work fine, the score went to 2 but the rest of it still didn’t work. This is why I’m assuming it’s a problem with the multiple triggers.

2

You need to manage the score from an external entity. Create a new GameObject and attach the following ScoreManagerscript.

using UnityEngine;
using UnityEngine.UI;

public class ScoreManager : MonoBehaviour
{
    // From the inspector, drag & Drop the GameObject holding the Text component used to display the score
    [SerializeField]
    private Text scoreText ;
    
    private int score;
    
    public int Score
    {
        get { return score ; }
        set
        {
            score = value ;
            scoreText.text = "Score: " + score.ToString ();
        }
    }
    
    private void Awake()
    {
        Score = 0;
    }
}

Then, on each hole, you have to reference the Score Manager

public class Hole: MonoBehaviour
{
    // From the inspector, drag & Drop the GameObject holding the ScoreManager created just before
    [SerializeField]
    private ScoreManager scoreManager ;

    void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag ("Green"))
        {
            scoreManager.Score++ ;
            other.gameObject.SetActive (true);
        }
        else if (other.gameObject.CompareTag ("Blue"))
        {
            scoreManager.Score--;
            other.gameObject.SetActive (false);
        }
        else if (other.gameObject.CompareTag ("Red"))
        {
            scoreManager.Score--;
            other.gameObject.SetActive (false);
        }
        else if (other.gameObject.CompareTag ("Yellow"))
        {
            scoreManager.Score--;
            other.gameObject.SetActive (false);
        }
    }
}