The main feature of Mandarin-Blueprint English Spoilers is its ability to hide the English translations of Mandarin sentences in the lesson content. This allows users to test their understanding of the language without the aid of English translations, promoting a more immersive learning experience. The add-on was initially created for personal use by the developer, but due to popular demand, it has been made available for others to benefit from.

By utilizing Mandarin-Blueprint English Spoilers, users can enhance their Mandarin learning journey by challenging themselves to comprehend sentences solely based on their Mandarin knowledge. This add-on provides a unique and effective way to practice the language by encouraging active engagement and reducing reliance on English translations.