Knock-Knock

Minimum

OS *: Windows XP or later Graphics: GPU that supports shader model 2.0 Storage: 700 MB available space

Minimum

OS: Mac OS X 10.5 or later Graphics: Intel HD Graphics 3000 Storage: 700 MB available space

Recommended

Graphics: Intel HD Graphics 4000

Minimum

OS: Ubuntu 10.10 or later Graphics: GPU that supports shader model 2.0 Storage: 700 MB available space