As in hard to glue together. In game terms assembling Katyushas are the Flames of War equivalent of a cross between Rubik's Cube and a 3D version of Twister. Which brings me to the stark realization of...how cool would 3D Twister be! I stared at the pieces for a while trying to imagine how they would go together, trying to align the pieces like my two year old son did trying to put Legos together. I felt like a caveman.