Bronze League Duolingo by DuyHuynh on DeviantArt

20 things I've learnt after using Duolingo for 200 days – Liz Learns Welsh

2023-01-23] Number 1 in the Diamond League

First in the Pearl league

Llovizna: Duolingo and how its rewards work

What happens when you finish first in the Diamond League on Duolingo? I cannot find the winner anywhere. Do they automatically drop them off the leaderboard? - Quora

How Duolingo's new gamification mechanism convinced me to pay, by Shengyu Chen

Duolingo review — Kelleher Bros.

Gamification in eLearning - Benefits, Methods & Real Examples - Belitsoft

The 26 Leagues Of Duolingo

Imagine getting this worked up over Duolingo - 9GAG