Lacuna
The Vocabulary App
The Most Words
Lacuna has 300,000+ unique words and 100,000,000+ unique questions.
Adaptive Question Selection
The game dynamically adapts to your skill level as you increase your rating.
Your Favorite Books
Practice in authentic and challenging sentences from 75,000+ Project Gutenberg texts.
Challenge Yourself
The competitive mode challenges you to improve your skills to climb the ranks.
Ready to play?