Summary After circulating this game around my office, there were a few common traits about these pieces that confused people. The first was the shape of the pieces when they were hollow; the hole is always circular, leading people to think that meant the shape itself was round even when it was square. And the last was that people kept playing the pieces upside-down without realizing it (since there was no hole on the bottom of hollow pieces, it would affect the game). My solution here was to match the shape of the hollow hole with the shape of the piece and to make them symmetrical so there was no top and bottom distinction, you can play them any orientation without confusion.