What innovation did Allen Lane introduce with Penguin Books in 1935 that revolutionized the publishing industry?

In the world of publishing, few brands have transformed access to literature as dramatically as Penguin Books. Founded in 1935, this publisher revolutionized the industry with a breakthrough concept that made quality literature affordable for the masses. Test your knowledge about this iconic publishing brand that changed how we consume books and helped democratize literature in the 20th century.

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High-quality paperback books at the price of a pack of cigarettes
Subscription-based book delivery service with monthly selections
Color-coded book covers organized by literary genre
First publisher to release simultaneous hardcover and audiobook formats