Crack the code of the Shadow Architect! Are you looking for a rigorous way to teach area and spatial reasoning? Detective Blue: The Shadow Architect’s Hideout is a 26-page "Print & Go" activity book that blends an immersive detective narrative with Shikaku (Rectangles) Math Logic Puzzles. When a mysterious architect builds a secret hideout, Detective Blue is called to find the entrance. Your students must step into the role of lead investigators, dividing complex grids into perfect rectangles