Duolingo ZH from EN versions:

Trees:
v0: 2013-10-25  ? (Beta)
v0: 2014-04-11  ? (Beta)
v1: 2016-03-03, 88 Skills (88 Different lessons)

Paths:
1.0: 2022-09-10, 88 Skills (88 Different lessons) (57 Units)
1.1: 2023-09-10, 88 Skills (88 Different lessons) (57 Units)

CEFR:
1.0: 2024-02-02, 67 skills (67 Different lessons) (CEFR A1) (43 Units)
1.1: 2024-05-01, 67 skills (67 Different lessons) (CEFR A1) (76 Units)

tree_zh-CN_en_a1_0_existing
tree_zh-CN_en_a1_0_new

https://liuch.github.io/duolingo_courses_overview/
https://duolingo.fandom.com/wiki/Course_list
https://duolingodata.com/
https://duolingodata.com/oldtable.html
https://ardslot.com/duolingocrowns.html

Edited by Mat!/Ozone, 2024-05-09.