Portal 2 (đi cảnh , giải đố)
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqEGqNXHN130NJhkI0i-6tqdtOzxseQBOg5MEWropMnvru_ui3jOXYsBU1_raG2KmjKCS_naQabKCqjYlpwVDtGbqyMVC6gfUjyvL9bFz1eg3fQDTPVyGP88qeK5ug_DXdpH4a0L_hiK8/s72-c/1.png
2 DVD