This amazing robot puzzle by Petit Collage includes two pairs of magic glasses that reveal secret hidden drawings. Featuring a fantastic illustration of a robot factory, with 100 pieces this will keep little ones occupied for hours. Once complete simply pop on the glasses to revel the magic hidden messages and drawings. This puzzle is suitable for children ages 4 and up and measures 47 cm x 38 cm. Printed with non-toxic inks on FSC certified card.