LetterLand is an AI-powered English learning application that dynamically generates word search and crossword search puzzles from user-provided materials such as text, URLs, or PDFs. Using the Google Gemini API, it extracts key vocabulary, definitions aligned with CEFR levels (A1–C2) to create personalized learning content. LetterLand also features pronunciation audio, achievements, and a performance dashboard that tracks progress, making vocabulary building more engaging, adaptive, and effective for learners of all ages.