Fat Brain Toys Yottsugo An amazing word puzzle challenge game; an exciting cross between sudoku and a crossword puzzle Build and connect interlocking words into a grid that reads both horizontally and vertically; grab a challenge card to choose which letters to use; stumped? Keep unfolding the card to find more clues Brain-busting fun for ages 12 and up; ideal for solitaire or group play; high quality, durable materials packaged in a sturdy, reusable storage container; letter tiles made of strong plastic, snap together easily Strengthens language skills, logic, reasoning, critical thinking, problem solving, creative thinking; words are all only 4 letters long  wordsmithery not required! Winner of multiple awards including Parents' Choice Silver Award, 3 Major Fun Awards; includes 55 letter tiles, 40 puzzles with clue books, detailed instructions; made in China Spelling Skills Logic Critical Thinking Creativity Problem-Solving Basic Vocabulary Solitaire or Group Play 40 Puzzles with Clue Books Designed for All Skill Levels Sturdy Storage Container