Protect the Kitten Mini‑Game: Source Code Overview and Agora Voice Chat Integration

The article introduces a Unity 2D mini‑game called "Protect the Kitten", showing a short gameplay video and describing the core mechanic where the player moves a block with the mouse to shield a kitten from obstacles.

It then outlines the project's directory structure, listing folders such as _Prefabs , _Scenes , _Scripts , _Sprites , Animations , Common , Music_Sound , Plugins , and Resources , and explains the role of each folder in the game.

The core gameplay logic is handled by two controller scripts: MainController and HomeController . MainController manages background loading, obstacle spawning, level progression, and UI updates, while HomeController contains only simple UI handling.

Key portions of MainController are shown below:

public class MainController : BaseController {
    public Transform backRegion, spawnRegion;
    public BackItem backPrefab;
    public List
obstaclePrefabs;
    private int colorIndex = 0, backCount = 0;
    private BackItem lastBack = null;
    public enum GameState {START, LOADED, PLAYING, GAME_OVER, COMPLETED, GUIDE, SHOP, PAUSED};
    public static GameState gameState = GameState.START, lastState = GameState.START;
    // ... (other fields omitted for brevity)
    protected override void Awake() {
        base.Awake();
        instance = this;
    }
    protected override void Start() {
        base.Start();
        SetupBackground();
        LoadAllObstacles();
    }
    private void LoadAllObstacles() {
        obstaclePrefabs = Resources.LoadAll
("GroupObstacles").ToList();
        obstaclePrefabs.Sort((x, y) => Utils.GetGroupObIndex(x.name).CompareTo(Utils.GetGroupObIndex(y.name)));
    }
    private void SetupBackground() {
        lastBack = SpawnNewBackground(Vector3.zero);
        lastBack.SetUp(0, 5, true, true, 0);
        backs.Add(lastBack);
        // ... (background setup logic)
    }
    // ... (additional game logic omitted)
}

The MyPlayer script is attached to the kitten object and handles sprite switching, collision detection, and visual effects when the kitten hits an obstacle.

public class MyPlayer : MonoBehaviour {
    public SpriteRenderer icon;
    public Sprite[] iconSprites;
    public GameObject playerIconPrefab;
    public GameObject bubble;
    public GameObject[] bubbleParts;
    void Start() { UpdateSprite(); }
    public void UpdateSprite() {
        int selectedType = CUtils.GetPlayerType();
        icon.sprite = iconSprites[selectedType];
    }
    void OnCollisionEnter2D(Collision2D collision) {
        if (collision.collider.tag == "Obstacle" && MainController.IsPlaying()) {
            MainController.instance.CollideWithObstacle();
            MainController.instance.CheckAndShowContinue();
            icon.gameObject.SetActive(false);
            GetComponent
().isTrigger = true;
            bubble.SetActive(false);
            foreach (GameObject p in bubbleParts) { p.SetActive(true); }
            GetComponent
().SetTrigger("Break");
            // ... (audio and visual effects)
        }
    }
    // ... (reset and icon spawning omitted)
}

To add voice chat, the article demonstrates importing Agora's Unity audio SDK and provides a complete script that initializes the SDK, handles permission requests, joins/leaves channels, and processes callbacks such as user join, leave, volume indication, and errors.

using UnityEngine;
using UnityEngine.UI;
#if (UNITY_2018_3_OR_NEWER)
using UnityEngine.Android;
#endif
using agora_gaming_rtc;

public class HelloUnity3D : MonoBehaviour {
    private InputField mChannelNameInputField;
    public Text mShownMessage;
    public Button joinChannel;
    public Button leaveChannel;
    private IRtcEngine mRtcEngine = null;
    [SerializeField]
    private string AppID = "app_id";
    void Awake() {
        QualitySettings.vSyncCount = 0;
        Application.targetFrameRate = 30;
        CheckAppId();
    }
    void Start() {
#if (UNITY_2018_3_OR_NEWER)
        if (!Permission.HasUserAuthorizedPermission(Permission.Microphone)) {
            Permission.RequestUserPermission(Permission.Microphone);
        }
#endif
        joinChannel.onClick.AddListener(JoinChannel);
        leaveChannel.onClick.AddListener(LeaveChannel);
        mRtcEngine = IRtcEngine.GetEngine(AppID);
        mRtcEngine.OnJoinChannelSuccess += (channelName, uid, elapsed) => {
            string msg = string.Format("Joined channel uid:{0}, channel:{1}, version:{2}", uid, channelName, getSdkVersion());
            Debug.Log(msg);
            mShownMessage.text = msg;
        };
        // ... (other callbacks omitted for brevity)
        mRtcEngine.SetChannelProfile(CHANNEL_PROFILE.CHANNEL_PROFILE_COMMUNICATION);
    }
    private void CheckAppId() {
        Debug.Assert(AppID.Length > 10, "Please set your Agora AppId.");
    }
    public void JoinChannel() {
        string channelName = "adc666"; // example channel
        if (string.IsNullOrEmpty(channelName)) return;
        mRtcEngine.JoinChannelByKey(null, channelName, "extra", 0);
    }
    public void LeaveChannel() {
        mRtcEngine.LeaveChannel();
    }
    void OnApplicationQuit() {
        if (mRtcEngine != null) IRtcEngine.Destroy();
    }
    public string getSdkVersion() { return IRtcEngine.GetSdkVersion(); }
    // ... (mute handling omitted)
}

The article provides a download link for the full project (https://download.csdn.net/download/zhangay1998/42304114) and notes that readers can obtain additional game source packages by following the public account instructions.

In summary, the piece shares the complete source of a simple Unity puzzle game, explains its architecture and key scripts, and shows a basic integration of Agora's voice SDK to enable multiplayer voice chat, offering a practical example for developers interested in Unity game development and real‑time communication.