Among other things, the document was also used as an entry ticket for those areas in which a 3G certificate was required. The reason is the reduction in school tests after Easter.
Until now, students had to take a corona test three times a week to attend school. For this, they each received a stamp in their passport, in which a vaccination could also be noted. With the fully stamped Ninja-Pass was then allowed to visit the gastronomy during the respective week (also on weekends).