https://blog.wongcw.com/2021/07/16/rovio%e7%9f%a5%e5%90%8d%e9%81%8a%e6%88%b2%e3%80%8aangry-birds-friends%e3%80%8b%e7%99%bc%e7%94%9f%e7%94%a8%e6%88%b6%e6%95%b8%e6%93%9a%e5%ba%ab%e8%bc%95%e5%be%ae%e6%b4%a9%e6%bc%8f/