English (Lessons or Legendary):
https://www-internal.duolingo.com/skill ... Proverbs/1
https://www-internal.duolingo.com/skill/en/Flirting/1
https://www-internal.duolingo.com/skill/en/Christmas/1
Portuguese (Lessons or Legendary):
https://www-internal.duolingo.com/skill ... Proverbs/1
https://www-internal.duolingo.com/skill/pt/Flirting/1
https://www-internal.duolingo.com/skill/pt/Christmas/1
English (Practice):
https://www-internal.duolingo.com/skill ... s/practice
https://www-internal.duolingo.com/skill ... g/practice
https://www-internal.duolingo.com/skill ... s/practice
Portuguese (Practice):
https://www-internal.duolingo.com/skill ... s/practice
https://www-internal.duolingo.com/skill ... g/practice
https://www-internal.duolingo.com/skill ... s/practice
German (Practice):
https://www-internal.duolingo.com/skill ... s/practice
https://www-internal.duolingo.com/skill ... g/practice
https://www-internal.duolingo.com/skill ... s/practice
German (Lessons or Legendary):
https://www-internal.duolingo.com/skill ... Proverbs/1
https://www-internal.duolingo.com/skill/de/Flirting/1
https://www-internal.duolingo.com/skill/de/Christmas/1
Explanation:
en/pt/de is the abbreviation for the TARGET language which needs to match your ACTIVE (- currently selected - L2 course.
Base/source is irrelevant.
/1 is the lesson number to complete crown sessions (it will automatically correct itself and increment the lesson counter from previously finished lessons).
Just repeat that Url for a few lessons.
If a bonus skill is finished the /1 (or /0) will start the Legendary crown sessions mode.
But I didn't complete those, so maybe they won't finish, as mentioned here by another user, and grading might fail at the end and give you no XPs.
Staff took down bonus skills after I practiced them on the Android app (checked several times; edit: was a false alarm).
They are not visible on the app or the web shop anymore and I cannot see them on my app tree (old version with the tree) for several courses.
Edit2: They come and go - very buggy and often the bonus row completely disappears.
Another issue: Leveling up one bonus skill to Legendary crown level made this skill permanently disappear on the bonus row. It doesn't show up again after app restart!
Maybe I shouldn't have reported an error with one of them, I believe it was Christmas
Q: Does Christmas bonus skill crash their server?
I remember there was a bigger error contained in 2016/17.
..(...)..
Bonus skills are available for these courses:
- Portuguese from English
- English from German
- German from English
- English from Portuguese
- ...
One skill "Flirting" was double listed on the old Android app, Idioms wasn't shown in the bonus row for my Portuguese (from English) course.
Completing Idioms&Proverbs on the Web didn't fix the app bug. That's a nice trick with the Web access.
Didn't test the rest.
Probably you will have had to buy one of the three BEFORE in the Lingot shop (before they got hidden) to make the system track and evaluate your work.
Highly guessing on my side.
On the old Android one of the courses (En from Pt probably??) offered me to buy one for 1000 Gems.
Now that option is also gone since today 28. January 2023 (edit: it is working again).