If standard number fill-in puzzles feel too simple, this book is built for you. This Advanced features massive 32×42 grids that demand focus, patience, and true logical endurance. Each puzzle offers a long, immersive solving experience far beyond typical fill-in books. What Makes This Book Different: ✔ Ultra-Large Grids (32×42): Significantly larger than traditional formats — ideal for extended, high-intensity solving sessions. ✔ Expert-Level Challenge: Designed for advanced puzzlers who want deep concentration and long logical workflows instead of quick, casual puzzles. ✔ High-Quality Layout: Sharp, easy-to-read numbers printed on premium interior pages to handle the large grid format without visual strain. ✔ Perfect for Brain Training: Improves focus, pattern recognition, and problem-solving stamina. ✔ A Unique Gift for Puzzle Enthusiasts: Ideal for fans of Zahlengitter, Number Fill-Ins, logic puzzles, and anyone who craves a tougher mental challenge. If you're ready to push the limits of what a number fill-in puzzle can be, this book will keep you engaged for hours. Go beyond ordinary puzzle books and experience deep, rewarding logical challenges like never before.