15年IGF入围的一款关卡制的解密游戏（基于网页，免费，有28个小关），进入下一关需要解开当前关的声音文件所隐藏着的密码。简单到倒放，复杂到缩放、拼接频谱文件，要通过一关真的需要一定的声音工程（乃至其他更多的，如密码学）本领才行。
引用一下介绍页面的话：
Phonopath is a puzzle game based entirely in audio.
Each stage of the game is comprised of a sound clip and password request. The password lies hidden within the audio file itself, and can only be revealed through critical listening, careful ****ysis and manipulation.
Phonopath aims to explore the limits of “the audio file as a puzzle medium”. Expect to learn something.