So You Want to Learn a Made-Up Language on Duolingo
It started with High Valyrian, then Klingon showed up, and somewhere along the line Duolingo kept adding more constructed languages to the mix. The appeal is obvious if you've ever wanted to read along with Game of Thrones subtitles or impress people at cons. But the reality of actually learning through it is messier than the marketing suggests. The catalog shifts. Some courses get deprecation notices and vanish without warning. As of now, High Valyrian and Klingon are the ones that have stuck around longest. Occasionally you see seasonal pop-up events for things like Na'vi or Old Tongue, but those come and go. The core fictional language courses that persist are built by Duolingo's in-house team and a handful of contracted linguists who specialize in conlangs. What makes these courses structurally different from Spanish or French is that there is no native speaker base validating the materials. That means mistakes slip through more easily, and there are fewer community-driven corrections happening in the comments. You're mostly flying solo once you hit the later skills.
I spent about three weeks drilling High Valyrian when it first launched as an unreleased beta course. The grammar trees are decent for the basics — noun cases, basic sentence structure, a few conjugation patterns. Then around Skill 8 things start getting thin. The vocabulary becomes repetitive because there simply aren't enough source texts to draw from. I hit a wall where every exercise was just rearranging the same five verbs. The workaround was switching to the Duolingo Discord community and cross-referencing with the official language guides published by the conlang creators. That alone probably cut my confusion rate in half.
How to Actually Make Progress
Don't treat it like a regular language course. The streak mechanic will drain your XP faster than your motivation because the feedback loop is broken — you complete a lesson, you have no one to speak to, and you forget half the vocabulary within a week. I learned this the hard way after maintaining a 47-day streak on Klingon and then realizing I couldn't form a single coherent sentence without looking at the skill tree. What actually works: Use Duolingo as the introductory layer only. Spend the first two to three weeks building familiarity with the alphabet, the basic sound system, and maybe 100 to 150 core words. After that, supplement with primary source material. For High Valyrian that means the language guides on kon dotorava.com. For Klingon, the kilin as Wesvay' and the Klingon Dictionary by Marc Okrand. Duolingo alone will get you to roughly an A1 level at best, and even that is generous. There's a specific trap most people fall into with constructed languages. Duolingo's exercise design assumes you need infinite variety in prompts, so it generates sentences that are grammatically correct but semantically bizarre. I once got four exercises in a row asking me to translate "the sword drinks the water" into High Valyrian. The grammar was right. Nobody has ever said that in the source material. It felt productive but wasn't. The fix is to periodically pause and read actual text in the language, even if it's just a paragraph from a translated scene. It grounds the grammar in something real instead of the algorithm's random sentence generator.
Get the Full Details
The other thing nobody warns you about is that fictional languages don't have the spaced repetition backing that natural languages get. Duolingo's algorithm was tuned on datasets from languages with millions of speakers and centuries of usage. Conlangs have far less data, so the review scheduling can be unreliable. Words you barely know might not show up again for weeks, and words you've already mastered could reappear daily. I tracked this myself after about two weeks and adjusted by keeping a separate Anki deck for the languages I was serious about learning. The Duolingo reminders became suggestions rather than gospel. If your goal is casual exposure — being able to say "na'tru' chugh" at a party or recognize Valyrian phrases in a show — Duolingo is fine. If your goal is actual literacy, you'll need to treat it as a starting point and invest real time in supplementary resources. The courses are well-designed for what they are, but they were never meant to replace the work of someone who actually grew up speaking the language every day.
