Can I choose the book for a personalized GBbook?

Yes. That is one of the main reasons the personalized GBbook exists in the first place. The product is built around the possibility of turning a chosen text into a dedicated Game Boy reading cartridge, which makes it much more personal than buying a generic ready-made novelty. That said, “yes” should not be read as “anything, automatically, under all conditions.” The suitability of a title can depend on practical and technical factors such as length, formatting, source quality, and the nature of the request. So the right mindset is that personalization is central to the product, but some requests may still need to be checked before production starts, especially when the text is unusual, very long, hard to format, or otherwise non-standard.