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 Raijin Software:
Kopfnuss Lite is the free Sidekick of the Top Ten Education App Kopfnuss. Like in the full version, you can train your brain in order to deal with all kinds of everyday numbers. Whether youre summing up your shopping bill or tipping appropriately at your local diner - soon everything appears to be as easy as 1+2=3. EXERCISES With Kopfnuss Lite, you can practice addition, division and calculating basic sums of money. Each exercise contains ten problems. Take your time solving them, there's no time limit. If you get one wrong, Kopfnuss Lite will show you the correct answer and ask the same question later again. If hard isn't challenging you anymore, Kopfnuss Lite will increase the level of difficulty. If your score withers, the problems get easier again. TIME TRIAL - Ready for a challenge? Time: 90 seconds. Math problems: one by one until you run out of time. Rules: credits for correct and quick answers, if you answer incorrectly, points will be deducted. Award: Highscore list entry and trophies on your own device. And you can publish your score on Facebook! USER MANAGEMENT Share Kopfnuss Lite with your family, your roommates, your best friend the app provides user profiles for each and everyone. To edit users or to add new people just tap the name on the start screen to enter the user management. The full version of Kopfnuss gets you among other things: Subtraction Multiplication Rule of Three Roman Numbers Square Numbers More Time Trial Modes Extensive Statistics