Solvelingua

The research behind the game

Solvelingua isn't built on hunches. Each of its systems puts a well-studied finding from second-language acquisition research to work. Here is what the research says, in plain language, and what we do with it.

You learn from what you can understand

People pick up a language mostly by understanding messages that are just a little beyond their level. If you know about 98% of the words in a passage, you can follow it and guess the rest. Captions help too: studies comparing captioned and uncaptioned video found captions improved both listening and vocabulary.

In Solvelingua: characters speak at your level and slow down when you ask. Subtitles help at the start and fade away as your level rises.

Krashen, 1985 · Hu & Nation, 2000 · Montero Perez et al., 2013 · Peters & Webb, 2018

Conversation is where it clicks

When you talk with someone and have to be understood, you naturally check meanings, rephrase and notice gaps. Decades of studies show this back-and-forth improves grammar and vocabulary, and the gains last. Speaking also forces you to build sentences yourself, which is different from recognizing them.

In Solvelingua: you speak or type freely to everyone in town, with no multiple-choice menus. Characters remember earlier conversations and ask you to clarify when they don't understand.

Long, 1996 · Swain, 1985 · Mackey, 1999 · Mackey & Goo, 2007

Feedback works, if you notice it

Correcting learners' mistakes reliably improves accuracy, across dozens of studies. But corrections only help when learners notice them, and quick, quiet corrections in the middle of a conversation often go unnoticed. Feedback after a task works too, and doesn't break the flow of talking.

In Solvelingua: after each conversation you see what you got right, what to fix and what to try next time. The evening diary rounds up the patterns that keep coming back.

Schmidt, 1990 · Lyster & Ranta, 1997 · Russell & Spada, 2006 · Li, 2010 · Lyster & Saito, 2010 · Li, Zhu & Ellis, 2016

Words stick when you pull them from memory, spaced out

Looking up a word in the moment helps you understand and learn it. Remembering it for good takes two more things: reviews spread out over time, and actually recalling the word rather than just re-reading it. Words you need for something real are remembered best of all.

In Solvelingua: tap any word to hear and translate it. It's saved to your collection, and the words you've met keep coming back in conversations, texts and jobs, so you recall them in real use.

Laufer & Hulstijn, 2001 · Cepeda et al., 2006 · Abraham, 2008 · Karpicke & Roediger, 2008 · Nation, 2013 · Uchihara et al., 2019

Learning by doing real things

Task-based language teaching builds learning around real goals, like ordering, selling or asking for directions, where language is the tool rather than the subject. Programs built this way show clear positive effects. A related method, learning through commands and actions, builds listening comprehension quickly.

In Solvelingua: errands, jobs and hobbies are all tasks with a real goal, each with the vocabulary that job actually uses. Your pet learns commands only when you say them in Spanish.

Asher, 1969 · Ellis, 2003 · Long, 2015 · Bryfonski & McKay, 2019

Living there, safely

We learn by joining a community, starting at the edges and moving toward the center. Studying abroad builds fluency, but research shows it isn't automatic: what matters is how much real contact you have with locals. Many learners abroad never get enough.

In Solvelingua: Mexico City gives you what a real semester abroad often can't: patient locals who always have time to talk, from shopkeepers to coworkers to friends.

Lave & Wenger, 1991 · Collentine & Freed, 2004 · Segalowitz & Freed, 2004

Confidence decides whether you speak

Anxiety about speaking a new language is common, and it is linked to lower achievement across nearly 20,000 learners. Enjoyment matters in its own right. Whether someone chooses to speak depends on confidence and on wanting to talk to a particular person, and learners keep going when they can picture their future self using the language.

In Solvelingua: there's no failing and no audience. Characters are patient, and they become people you want to talk to. Your character's new life is the future self you're working toward.

Horwitz et al., 1986 · MacIntyre et al., 1998 · Dörnyei, 2009 · Dewaele & MacIntyre, 2014 · Teimouri et al., 2019

A little grammar goes a long way

Immersion alone doesn't fix every grammar mistake. Summaries of dozens of studies show focused, explicit instruction produces large, lasting gains, especially when it targets what a learner is ready for next.

In Solvelingua: free, optional classes at the community center adapt to your level and to the mistakes you've been making around town.

Vygotsky, 1978 · Norris & Ortega, 2000 · Spada & Tomita, 2010

Games, texting and AI characters

Good games already teach well: you take on a role, learn things just when you need them, and failure is cheap. Frequent gamers tend to have stronger vocabularies. Text chat counts as real conversation, with benefits similar to talking face to face. AI conversation partners are patient and always available, but early studies found interest in them faded once the novelty wore off.

In Solvelingua: characters with memories, relationships and a city to live in keep conversations meaningful long after the novelty wears off. Texts and voice notes count as practice too.

Payne & Whitney, 2002 · Gee, 2003 · Sundqvist & Wikström, 2015 · Ziegler, 2016 · Fryer et al., 2017 · Sykes, 2018 · Reinhardt, 2019 · Huang et al., 2022

Where we're careful

The research also points to traps. A translator can replace learning instead of supporting it, so ours works best after you've tried on your own. Too much correction raises anxiety, so feedback focuses on a few patterns at a time. Most studies happen in classrooms, not games, so we plan to measure our own players' progress.

Lee, 2020 · Boers & Faez, 2023

Sources

Every journal article below was checked against its DOI record.