Bronze League Duolingo by DuyHuynh on DeviantArt

Duolingo Leagues explained - Duolingo Guide

We live to compete. What I learned by winning the Duolingo diamond league, by Karolina Kozmana

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

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

Just another example of how the competition in the leagues is becoming more and more ridiculous. The leader of the demotion zone has 1,831 XP, while first place has 17,460 XP. This

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

The 26 Leagues Of Duolingo

Duolingo - When you finish #1 in the Diamond League 💎

Ruby league: Is it worth the grind? : r/duolingo

Duolingo Leagues & Leaderboards - EVERYTHING You Need To Know - duoplanet