Kölsch has been brewed according to the purity law for centuries. Kölsch is so deeply rooted in the city that the people of Cologne even speak Kölsch. That's why the people of Cologne speak so fluently. But suddenly the brewers receive a blackmail letter: 
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Dear brewers: 

You should not have done that. You have protected your Kölsch as a regional specialty. Kölsch is in the same league as champagne, cognac and the Spreewald cucumber.

Simply ridiculous!

Revoke this protection of the market. Otherwise we will sabotage your brewing process and you will lose this protection forever.

Only you can prevent this sabotage. The threat lurks at every station. Only when you have solved the tasks at all the stations correctly can the brewers breathe a sigh of relief. And you can proudly enjoy a freshly tapped, pure Kölsch beer.
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