One of the first courses I completed when I was studying French was the course “Mission Europe: Paris”. With German, it was no different. In just one day I finished “Mission Europe: Berlin“.
Mission Europe are courses developed with the support of the European Union to promote three languages: French, German and Polish. Currently, the courses can be found on the Deutsche Welle website.
The course is aimed at A1 level students, and has always as background a mystery story that works like a video game, where you earn points or lost lives. There are 26 lessons that last 5 minutes each.