Codes are made for cracking. What secrets are hiding in these engaging enigmas? Readers of this interactive book will find out. They'll stretch their problem-solving muscles with these perplexing coded puzzles. Riddles help readers develop critical and creative thinking skills. Handy intros to each puzzle help readers in a pinch. Charming illustrations accompany each riddle. Readers will practice their language, logic, and math skills while having fun.

There's more than what meets the eye in these puzzling pictures. Readers will pour over the pages of this immersive book of image-based riddles. Even reluctant readers will love engaging with these mysterious visual conundrums. Each puzzle features charming illustrations. Handy intros to each puzzle help readers get started. As they progress through each problem, readers will develop critical and creative thinking skills. They'll practice logic and reasoning. Fun and accessible, these unique puzzles will entertain readers for hours, making this a popular addition to any library or classroom.

There are many distinct pleasures associated with computer programming. Craftsmanship has its quiet rewards, the satisfaction that comes from building a useful object and making it work. Excitement arrives with the flash of insight that cracks a previously intractable problem. The spiritual quest for elegance can turn the hacker into an artist. There are pleasures in parsimony, in squeezing the last drop of performance out of clever algorithms and tight coding. The games, puzzles, and challenges of problems from international programming competitions are a great way to experience these pleasures while improving your algorithmic and coding skills. This book contains over 100 problems that have appeared in previous programming contests, along with discussions of the theory and ideas necessary to attack them. Instant online grading for all of these problems is available from two WWW robot judging sites. Combining this book with a judge gives an exciting new way to challenge and improve your programming skills. This book can be used for self-study, for teaching innovative courses in algorithms and programming, and in training for international competition. The problems in this book have been selected from over 1,000 programming problems at the Universidad de Valladolid online judge. The judge has ruled on well over one million submissions from 27,000 registered users around the world to date. We have taken only the best of the best, the most fun, exciting, and interesting problems available.

"Instructions for children on coding and creating programs on computers"--

Readers can count on a good time with this book of numerical mysteries. They'll dig into clever number puzzles and gain confidence in their problem-solving skills. Engaging riddles make math, logic, and reasoning fun even for reluctant readers. They'll develop critical and creative thinking skills. Original illustrations bring charm to each puzzle. Helpful hints encourage readers to find every answer. Accessible and interactive, this fun book will be popular in any library.

Train your brain with these fiendishly difficult puzzles, the perfect companion for anyone wanting to keep their mind busy 'Fiendishly tricky' Daily Mail With their first bestselling book, The GCHQ Puzzle Book, the UK's intelligence and security experts tested us with puzzles, codes and real-life entrance tests from their archives. Now, they are back with a NEW collection of head-scratching, mind-boggling and brain-bending puzzles that will leave you pondering for hours. For those who often found themselves stumped with the first book, The GCHQ Puzzle Book 2 offers even more starter puzzles to get those brains warmed up. Puzzle aficionados needn't worry though, as there is also an 'Even Harder' section to test everyone to their limits . . . Not only that, but in celebration of GCHQ's centenary, the puzzles in this new book sit alongside stories, facts and photos from the organisation's first 100 years at the heart of the nation's security. From the Government Code & Cipher School, to Bletchley Park, through to protecting against cyberattacks, the security of our country is in the hands of GCHQ. With this book, you get exclusive snapshots into the organisation that keeps us all safe. Train your brain to compete with the smartest in the country with this stimulating book of puzzles. If you haven't yet tested yourself with the first instalment of The GCHQ Puzzle Book, check it out now! 'This is the perfect gift to fuel his ludicrous presumption that he could have definitely been a spy - even better if he's already dog-eared the first version' Huffington Post

This engaging range of different types of puzzles lets readers stretch all their problem-solving muscles. They'll develop math, language, logic, reasoning, and critical thinking skills while having a blast. This unique combination of visual, number-based, and language-based riddles will keep readers entertained for hours. Playful illustrations add charm to every problem. Helpful introductions to each problem give readers a handy starting point. Age-appropriate, accessible, and fun, this collection of engaging puzzles will be a favorite in any library or classroom.

Unlock the secrets to creating random mazes! Whether you're a game developer, an algorithm connoisseur, or simply in search of a new puzzle, you're about to level up. Learn algorithms to randomly generate mazes in a variety of shapes, sizes, and dimensions. Bend them into Moebius strips, fold them into cubes, and wrap them around spheres. Stretch them into other dimensions, squeeze them into arbitrary outlines, and tile them in a dizzying variety of ways. From twelve little algorithms, you'll discover a vast reservoir of ideas and inspiration. From video games to movies, mazes are ubiquitous. Explore a dozen algorithms for generating these puzzles randomly, from Binary Tree to Eller's, each copiously illustrated and accompanied by working implementations in Ruby. You'll learn their pros and cons, and how to choose the right one for the job. You'll start by learning six maze algorithms and transition from making mazes on paper to writing programs that generate and draw them. You'll be introduced to Dijkstra's algorithm and see how it can help solve, analyze, and visualize mazes. Part 2 shows you how to constrain your mazes to different shapes and outlines, such as text, circles, hex and triangle grids, and more. You'll learn techniques for culling dead-ends, and for making your passages weave over and under each other. Part 3 looks at six more algorithms, taking it all to the next level. You'll learn how to build your mazes in multiple dimensions, and even on curved surfaces. Through it all, you'll discover yourself brimming with ideas, the best medicine for programmer's block, burn-out, and the grayest of days. By the time you're done, you'll be energized and full of maze-related possibilities! What You Need: The example code requires version 2 of the Ruby programming language. Some examples depend on the ChunkyPNG library to generate PNG images, and one chapter uses POV-Ray version 3.7 to render 3D graphics.

From the widely acclaimed author of The Gone-Away World and Tigerman, comes a virtuosic new novel set in a near-future, high-tech surveillance state, that is equal parts dark comedy, gripping detective story, and mind-bending philosophical puzzle. "A Pynchonesque mega-novel that periodically calls to mind the films of Inception and The Matrix…. What a ride!" —The Washington Post In the world of Gnomon, citizens are constantly observed and democracy has reached a pinnacle of 'transparency.' Every action is seen, every word is recorded, and the System has access to its citizens' thoughts and memories—all in the name of providing the safest society in history. When suspected dissident Diana Hunter dies in government custody, it marks the first time a citizen has been killed during an interrogation. The System doesn't make mistakes, but something isn't right about the circumstances surrounding Hunter's death. Mielikki Neith, a trusted state inspector and a true believer in the System, is assigned to find out what went wrong. Immersing herself in neural recordings of the interrogation, what she finds isn't Hunter but rather a panorama of characters within Hunter's psyche: a lovelorn financier in Athens who has a mystical experience with a shark; a brilliant alchemist in ancient Carthage confronting the unexpected outcome of her invention; an expat Ethiopian painter in London designing a controversial new video game, and a sociopathic disembodied intelligence from the distant future. Embedded in the memories of these impossible lives lies a code which Neith must decipher to find out what Hunter is hiding. In the static between these stories, Neith begins to catch glimpses of the real Diana Hunter—and, alarmingly, of herself. The staggering consequences of what she finds will reverberate throughout the world. A dazzling, panoramic achievement, and Nick Harkaway's most brilliant work to date, Gnomon is peerless and profound, captivating and irreverent, as it pierces through strata of reality and consciousness, and illuminates how to set a mind free. It is a truly accomplished novel from a mind possessing a matchless wit infused with a deep humanity.

** WINNER OF 'STOCKING FILLER OF THE YEAR AWARD' GUARDIAN ** Pit your wits against the people who cracked Enigma in the official puzzle book from Britain's secretive intelligence organisation, GCHQ. 'A fiendish work, as frustrating, divisive and annoying as it is deeply fulfilling: the true spirit of Christmas' Guardian 'Surely the trickiest puzzle book in years. Crack these fiendish problems and Trivial Pursuit should be a doddle' Daily Telegraph If 3=T, 4=S, 5=P, 6=H, 7=H ...what is 8? What is the next letter in the sequence: M, V, E, M, J, S, U, ? Which of the following words is the odd one out: CHAT, COMMENT, ELF, MANGER, PAIN, POUR? GCHQ is a top-secret intelligence and security agency which recruits some of the very brightest minds. Over the years, their codebreakers have helped keep our country safe, from the Bletchley Park breakthroughs of WWII to the modern-day threat of cyberattack. So it comes as no surprise that, even in their time off, the staff at GCHQ love a good puzzle. Whether they're recruiting new staff or challenging each other to the toughest Christmas quizzes and treasure hunts imaginable, puzzles are at the heart of what GCHQ does. Now they're opening up their archives of decades' worth of codes, puzzles and challenges for everyone to try. In this book you will find: - Tips on how to get into the mindset of a codebreaker - Puzzles ranging in difficulty from easy to brain-bending - A competition section where we search for Britain's smartest puzzler Good luck! 'Ideal for the crossword enthusiast' Daily Telegraph