Your mission:

Today you have what is probably the most important task of your life ahead of you. Humanity is facing a great challenge because a virus is spreading that will make everyone forget their fondest childhood memories. It is said that there is an antidote, which is located somewhere in the Lion City of Braunschweig. However, the exact location is not publicly known. The antidote is the only way to stop the precess of forgetting your childhood memories. You have asked around and found out from many sources that there is someone in the Schloss museum who knows the location of the antidote. Full of hope, you set off to meet this person, and you succeeded! You have found the person! However, she only handed you a rucksack and told you that she didn't know where the antidote was. You first have to solve a few tasks and puzzles with the help of the rucksack. If you succeed, you will get the antidote and the virus will no longer be able to harm you. Full of motivation, you take a closer look at the rucksack and discover, to your regret, that almost all the pockets are locked with locks that can only be opened using numerical codes or keys. In a small book, you come across the first puzzle that you need to solve to get a little closer to your goal. So off you go! You don't know how much time you have left before the virus hits you and you forget the best memories of your childhood. 

Will you make it in time?