private void LoadNextLevel()
    {
        int currentSceneIndex = SceneManager.GetActiveScene().buildIndex;
        SceneManager.LoadScene(currentSceneIndex);
        int nextSceneIndex = currentSceneIndex + 1;

        if (nextSceneIndex == SceneManager.sceneCountInBuildSettings)
        {
            nextSceneIndex = 0; // loop back to start
        }
        SceneManager.LoadScene(nextSceneIndex);
    }