The functionality of tags could be improved.

The main motivation behind this feature is to make it easier for the user to find tasks to a certain topic, which would also help by the creation of Generic Tasks and Theme-based trails.

Therefore it would be great if the user could filter all tasks by topic (i.e. "linear function") and get a list with all corresponding tasks.
From my point of view it would be better to have all those information on a separate website instead of on the map, as on the map you only see the grade and the title.

Optional: The user could also decide which information from the database he wants (language code, solution type,…), default would be all information.