Server based highscores:

http://www.unifycommunity.com/wiki/index.php?title=Server_Side_Highscores

Pretty straightforward.

@MikezNesh

For a local highscore save data on PlayerPrefs (if it's not full) Do this:

function AddScore(name : String, score : int){
   var newScore : int;
   var newName : String;
   var oldScore : int;
   var oldName : String;
   newScore = score;
   newName = name;
   for(i=0;i<10;i++){
      if(PlayerPrefs.HasKey(i+"HScore")){
         if(PlayerPrefs.GetInt(i+"HScore")<newScore){ 
            // new score is higher than the stored score
            oldScore = PlayerPrefs.GetInt(i+"HScore");
            oldName = PlayerPrefs.GetString(i+"HScoreName");
            PlayerPrefs.SetInt(i+"HScore",newScore);
            PlayerPrefs.SetString(i+"HScoreName",newName);
            newScore = oldScore;
            newName = oldName;
         }
      }else{
         PlayerPrefs.SetInt(i+"HScore",newScore);
         PlayerPrefs.SetString(i+"HScoreName",newName);
         newScore = 0;
         newName = "";
      }
   }
}

To display the high score set up a GUI to display the text and int in a table and store the information from player prefs in variables. Initialise the high score table by calling AddScore at the start of your game.

var 1stScore : int;
var 1stName : String;
var 2ndScore : int;
var 2ndName : String;
etc...

function UpdateHScore(){
   1stScore = PlayerPrefs.GetInt(0HScore);
   1stName = PlayerPrefs.GetString(0HScoreName);
   etc....
}

Alternatively use PlayerPrefsX from the wiki:

http://www.unifycommunity.com/wiki/index.php?title=ArrayPrefs

How could I revert it to? name01 85s name02 101s name03 150s . . . I mean from the lowest value to the highest?

How could I revert it to? name01 85s name02 101s name03 150s . . . I mean from the lowest value to the highest?

I used the code above and I feel like it goes in to a loop uncontrolled. Here is an example of what happens. If the player gets a new score that is higher then the highest score then it wipes out the old score and replaces it with the highest.

So: Dan : 75 Dan : 50 Dan : 25 Dan : 25 Dan : 25

Becomes: Dan : 100 Dan : 100 Dan : 100 Dan : 100 Dan : 100

Hi this is a very simple high score system for saving a int score and a name. Hope the code is clear

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


/// <summary>
/// High score manager.
/// Local highScore manager for LeaderboardLength number of entries
/// 
/// this is a singleton class.  to access these functions, use HighScoreManager._instance object.
/// eg: HighScoreManager._instance.SaveHighScore("meh",1232);
/// No need to attach this to any game object, thought it would create errors attaching.
/// </summary>

public class HighScoreManager : MonoBehaviour
{

    private static HighScoreManager m_instance;
    private const int LeaderboardLength = 10;

    public static HighScoreManager _instance {
       get {
         if (m_instance == null) {
          m_instance = new GameObject ("HighScoreManager").AddComponent<HighScoreManager> ();          
         }
         return m_instance;
       }
    }

    void Awake ()
    {
       if (m_instance == null) {
         m_instance = this;      
       } else if (m_instance != this)       
         Destroy (gameObject);    

       DontDestroyOnLoad (gameObject);
    }

    public void SaveHighScore (string name, int score)
    {
       List<Scores> HighScores = new List<Scores> ();

       int i = 1;
       while (i<=LeaderboardLength && PlayerPrefs.HasKey("HighScore"+i+"score")) {
         Scores temp = new Scores ();
         temp.score = PlayerPrefs.GetInt ("HighScore" + i + "score");
         temp.name = PlayerPrefs.GetString ("HighScore" + i + "name");
         HighScores.Add (temp);
         i++;
       }
       if (HighScores.Count == 0) {       
         Scores _temp = new Scores ();
         _temp.name = name;
         _temp.score = score;
         HighScores.Add (_temp);
       } else {
         for (i=1; i<=HighScores.Count && i<=LeaderboardLength; i++) {
          if (score > HighScores [i - 1].score) {
              Scores _temp = new Scores ();
              _temp.name = name;
              _temp.score = score;
              HighScores.Insert (i - 1, _temp);
              break;
          }      
          if (i == HighScores.Count && i < LeaderboardLength) {
              Scores _temp = new Scores ();
              _temp.name = name;
              _temp.score = score;
              HighScores.Add (_temp);
              break;
          }
         }
       }

       i = 1;
       while (i<=LeaderboardLength && i<=HighScores.Count) {
         PlayerPrefs.SetString ("HighScore" + i + "name", HighScores [i - 1].name);
         PlayerPrefs.SetInt ("HighScore" + i + "score", HighScores [i - 1].score);
         i++;
       }

    }

    public List<Scores>  GetHighScore ()
    {
       List<Scores> HighScores = new List<Scores> ();

       int i = 1;
       while (i<=LeaderboardLength && PlayerPrefs.HasKey("HighScore"+i+"score")) {
         Scores temp = new Scores ();
         temp.score = PlayerPrefs.GetInt ("HighScore" + i + "score");
         temp.name = PlayerPrefs.GetString ("HighScore" + i + "name");
         HighScores.Add (temp);
         i++;
       }

       return HighScores;
    }

    public void ClearLeaderBoard ()
    {
       //for(int i=0;i<HighScores.
       List<Scores> HighScores = GetHighScore();

       for(int i=1;i<=HighScores.Count;i++)
       {
         PlayerPrefs.DeleteKey("HighScore" + i + "name");
         PlayerPrefs.DeleteKey("HighScore" + i + "score");
       }
    }

    void OnApplicationQuit()
    {
       PlayerPrefs.Save();
    }
}

public class Scores
{
    public int score;

    public string name;

}

to check if this work check the following script, just add this to a game object and you will be able to check its functionality

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

public class MenuController : MonoBehaviour {

    string name="";
    string score="";
    List<Scores> highscore;

    // Use this for initialization
    void Start () {
       EventManager._instance._buttonClick += ButtonClicked;

       highscore = new List<Scores>();

    }


    void ButtonClicked(GameObject _obj)
    {
       print("Clicked button:"+_obj.name);
    }

    // Update is called once per frame
    void Update () {

    }

    void OnGUI()
    {
       GUILayout.BeginHorizontal();
       GUILayout.Label("Name :");
       name =  GUILayout.TextField(name);
       GUILayout.EndHorizontal();

       GUILayout.BeginHorizontal();
       GUILayout.Label("Score :");
       score =  GUILayout.TextField(score);
       GUILayout.EndHorizontal();

       if(GUILayout.Button("Add Score"))
       {
         HighScoreManager._instance.SaveHighScore(name,System.Int32.Parse(score));
         highscore = HighScoreManager._instance.GetHighScore();   
       }

       if(GUILayout.Button("Get LeaderBoard"))
       {
         highscore = HighScoreManager._instance.GetHighScore();      
       }

       if(GUILayout.Button("Clear Leaderboard"))
       {
         HighScoreManager._instance.ClearLeaderBoard();      
       }

       GUILayout.Space(60);

       GUILayout.BeginHorizontal();
       GUILayout.Label("Name",GUILayout.Width(Screen.width/2));
       GUILayout.Label("Scores",GUILayout.Width(Screen.width/2));
       GUILayout.EndHorizontal();

       GUILayout.Space(25);

       foreach(Scores _score in highscore)
       {
         GUILayout.BeginHorizontal();
         GUILayout.Label(_score.name,GUILayout.Width(Screen.width/2));
         GUILayout.Label(""+_score.score,GUILayout.Width(Screen.width/2));
         GUILayout.EndHorizontal();
       }
    }
}