Water Challenge's Riddle Book Surpasses 3 Million YouTube Subscribers and Goes to Reprint

The beloved riddle book titled "I'm So Sorry! Mr. Sumai's Riddle Book" has officially announced its reprint less than two weeks after its initial release, thanks to overwhelming demand. This fun-filled book features riddles with popular characters from the YouTube channel Water Challenge, which boasts over 3 million subscribers.

Meet Mr. Sumai!

One of the standout characters in this book is Mr. Sumai, who is the main figure of the Water Challenge YouTube channel, known for its Minecraft-themed content and entertaining projects. Mr. Sumai is well-loved among kids for his humorous antics and his catchphrase, "Su-manaiiii!" His character, embodying a strong sense of justice, captivates audiences with his wild shenanigans and comical nature.

Accompanied by his vibrant students from Sumai School, Mr. Sumai embarks on a series of exciting adventures that are both hilarious and thought-provoking, making for a delightful read for children.

Riddles Galore!

Within the pages of "I'm So Sorry! Mr. Sumai's Riddle Book", children are treated to an incredible variety of challenges, featuring a total of 240 riddles! The story follows two siblings, Yuzuru and Yuzuki, who, after watching one of Mr. Sumai’s broadcasts, unexpectedly get drawn into a viewer-participation event where they face off against a series of riddles alongside Mr. Sumai and his friends.

The challenges are divided into 8 unique stages, each tailored to different characters, providing an exciting and interactive experience. Children will find not only traditional riddles but also puzzles like finding differences and searching for pictures, offering ample fun!

Special Promotions

Additionally, select bookstores across the country are offering a limited-edition original postcard as a purchase bonus. Some bookstores have reportedly run low on this popular item, so enthusiasts should act quickly to grab their copy of the book and the exclusive merchandise.

Author Background

The Water Challenge channel has become a significant player in the realm of YouTube, with its focus on engaging content centered around popular games like Minecraft. The channel hosts various creative endeavors, including live gameplay and themed events. Alongside the riddle book, they have published titles such as "Water Challenge Official Fan Book" and "Let’s Play Minecraft with Water Challenge!" both with KADOKAWA.