25 math and logic puzzles that make students think, argue, and forget they're doing math — with detailed teaching walkthroughs for every single one. These aren't worksheet problems. They're tangrams, strategy games, logic grids, probability experiments, and optimization puzzles — the kind of math that makes students lean forward instead of check out. Every puzzle includes step-by-step instructions with full teaching guidance, a teacher tip explaining the key mathematical insight, and grade adap