What you could improve: - get the vocabulary for each CEFR level from a reliable source. "der Sir" is definitely not A1 German, it's only used for British knig

What you could improve: - get the vocabulary for each CEFR level from a reliable source. "der Sir" is definitely not A1 German, it's only used for British knights, way too specific. - accept all correct responses. English "just" can mean "a very short time ago," "only" or "fair," and each of these has more than one possible German translation. - don't make the user choose their level, determine it automatically based on what they do and don't know.