Get Enabled Levels

protected static string[] GetEnabledScenePaths()
{
    if (EditorBuildSettings.scenes.Length > 0)
    {
        int i = 0;

        foreach (EditorBuildSettingsScene tScene in EditorBuildSettings.scenes)
        {
            if (tScene.enabled)
            {
                i++;
            }
        }

        if (i > 0)
        {
            string[] levels = new string[i];
            int idx = 0;

            foreach (EditorBuildSettingsScene tScene in EditorBuildSettings.scenes)
            {
                if (tScene.enabled)
                {
                    levels[idx++] = tScene.path;
                }
            }

            return levels;
        }
    }

    return null;
}