The Big Book of Super Mario: The Unofficial Guide to Super Mario and the Mushroom Kingdom Kindle Edition - 49p @ Amazon

As b3ta would say, it's worthy of a pearoast (repost) as it's went down considerably from 79p to 49p.

I think it's okay to lazily copy / paste my own blurb:

Google Books still has this for 79p - click on the "Buy Ebook" red button on the left, if Google Books is better for you (eg, Google Rewards Credit)
A comprehensive, colorful look at everything to know and love about Super Mario, with character profiles, gameplay tips, and little-known trivia
For over 35 years, gamers young and old have gone on fantastic adventures with Mario, Luigi, Peach, Yoshi, and friends.
The Big Book of Super Mario is a colorful celebration of that rich history from the 1980s to today!
This deluxe guide also features exclusive content and strategy on recent Nintendo Switch games like Super Mario Odyssey and Super Mario Maker 2, plus an in-depth look at the new Super Mario 3D World + Bowser's Fury.
With dozens of full-color game images, this journey into the Mushroom Kingdom is a must-have for all Mario fans.

*Due to its large file size, this book may take longer to downloadNo reviews on Amazon UK, but Goodreads has a page about it and ratings - but just one written review: The Big Book of Super Mario: The Unofficial Guide to Super Mario and the Mushroom Kingdom by Triumph Books | Goodreads (the overall score on there is 3.45 out of 5).
Not finding a lot of reviews, to be honest, but the average score on Amazon US is 4.2 / 5, (still) no published feedback, though.