"A Where’s Waldo? for lovers of trains and travel, this look-and-find by Brooklyn-based illustrator Kim takes readers into bustling subway systems in 12 of the world’s great metropolises, from New York City to Sydney, Australia. Children will love searching for these beautiful foreign items while indulging in the common kid obsession over locomotives." - Booklist
"This is SUCH a cool book on so many different levels. There is the around the world nature of the book which offers diversity of people and languages and trains, but also invites comparison and discussions about similarities. There is the train aspect which is obviously the focus and for a kid who loves trains there is a lot to learn about subway systems on these pages. There is a look-and-find element that is always fun in this case also encourages a discussion about the culture and food and clothing of the different countries. And then there is the numbers element on each page. The stats about the train provide opportunities for counting, reading longer numbers, comparison with the number stats on other pages – so much potential for learning." - My Storytime Corner
"The blocky, highly stylized art is especially appealing, and a glossary at the end briefly explains the seek-and-find objects. Underground provides an entertaining, highly visual experience that delivers a global context to subway ridership." - Shelf Awareness
"This is such an engaging way to introduce underground transportation to kids. I could see this being used as part of a geography unit, or a unit on transportation, or a fun book to take on a trip to a big city to compare what you see with what is in the book." - Kids Lit Life
"Underground is a charming, fact-packed seek-n-find book. The words are very readable and making this a good book for train-obsessed kindergartners and first graders. The illustrations are bold and colorful with an Asian feel." - Kids Book Buzz
"I love the cartoon illustrations and how the objects are hidden so cleverly in between train cars or behind passengers. The art is brightly colored, and there are tons of little details in each scene that make it special and interesting. I am really impressed with how this book is organized. Some of the pages are cropped so that you can flip to see the people inside of the subway trains. It’s a smart and effective design." - Luminous Libro
"In Uijung Kim’s fabulous and attractive book, young readers will learn about some much beloved subway systems in 10 international cities, as well as getting a feel for some of the cultural heritage of Seoul, Madrid, New York, London and many others. Kim’s graphic, fun illustration brings subway systems to life for little ones at a time when many of them are obsessed with trains, trucks and cars – a perfect read at home and on the go!" - BookTrust, UK
"I found Underground was great fun for adults as well as children! The illustrations are bright, busy and hugely visual with a naive style children would love. Underground appeals to children of many ages because the facts and figures are themselves interesting, and there’s enormous potential for research into geography and culture through the places included. I found it quite tricky to spot some of the hidden items to be found and I think this is an excellent feature. It teaches children patience and observation whilst being fun. Underground is a book with a simple premise but considerable potential beyond its initial intention. I was impressed." - Linda's Book Bag
"A tremendously fun look at 10 different subway systems around the world. An ideal book to share for children aged 4-9." - School Reading List *recommended children's transport book*, UK
