Description 100 quizzes carefully selected by the world's leading brain game experts — "Brain Games Book for Adults." One. All kinds of puzzles! Not sure what you'll like? We've got it all covered. This book includes a wide variety of puzzles and quizzes, including word searches, spot-the-difference, nonograms, coloring pages, mazes, number-connecting puzzles, crossword puzzles (in both English and Korean), and sudoku. Challenge your brain with a different puzzle every day. In particular, the crossword puzzles are divided into Korean and English versions to suit different tastes, letting you truly test your vocabulary and general knowledge in both languages. Two. A level of difficulty that keeps your brain stimulated! These puzzles won't solve themselves easily. Written by a world-renowned brain game expert, this book offers just the right level of challenge to keep your mind engaged. The puzzles range widely in difficulty — from simple number-connecting puzzles that reveal fun shapes, to challenging 30x30 nonograms; from relaxing coloring pages to spot-the-difference puzzles that require careful attention to size, color, spacing, and other fine details. With such a wide range of difficulty, you'll not only stay motivated but also feel a real sense of accomplishment. What if you just keep getting smarter the more you solve? Three. Your own smart stay-at-home routine to get through the pandemic era. In the age of COVID-19, what's your stay-at-home routine? Between working from home and taking online classes, staying indoors all the time can leave you feeling low in both body and spirit. To overcome this, having your own consistent routine is essential. Spend time with "Brain Games Book for Adults" every day and enjoy both fun and a sense of achievement. Solving too much at once can be tiring, so setting a reasonable amount to complete each day can add a little spark to your daily life. And seeing the finished result right in front of you makes it all the more rewarding!