The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Prop Group:
Space Viking is the demo game that you learn how to create in theLearning Cocos2D book by Rod Strougo and Ray Wenderlich, published byAddison-Wesley.You play as Ole the Viking, frozen in time, and awaken in an Alienplanet. You must fight off the alien hordes and find a way back toyour native land and time.The book shows you how to build this game step-by-step, whichdemonstrates how to program the following features: * Moving a character with joystick controls * Animating characters * Enemies and basic AI * Making side-scrolling levels * Making a cart racing game with realistic game physics * Making a platformer jumping game * And much more!This game is meant for people who are interested in learning gameprogramming on the iPhone, at this timeonly sample levels are included.