[BUG report] Changing the URL makes it possible to access locked down lessons
On an account which has the "Clothing"(example) lessons locked I am able to acces it anyway. The only thing I have to do is:
Take a link to another lesson: https://www.duolingo.com/skill/it/Basics-1/2
Replace "Basics-1" with "Clothing"(or any name) and change the lesson number if wanted.
I haven't tested what happens if you succesfully complete a lesson you accessed this way.
French Spiritual skill, Lesson 1, first sentence I encountered:
Do you think users will take your advice to access a lesson in a locked skill and cheat their way out of the tree (with Google Translate of course) just to get a Golden Owl (I have read the comments below, finishing a skill using the method you have provided above tests you out of previous, unfinished skills)? I'm not sure how the tree algorithm knows you legitimately finished (or successfully tested out of) a skill. It seems probable to me they'd do that though...
On another, slightly unrelated note: I have the Spanish for French course, and completing some Spanish lessons and skills on the Spanish-English course, has tested me out of some skills (the trees are virtually the same at the beginning).