There aren't suppose more than six. That what the other shapes are for (the star, moon, crown, and comet shaped puyos).
If you still have the mmf2 example, try setting the value to like 1000 or so.
If you played Dr Robotnik's Meanbeam Machine, its the same deal. It's engine use from Puyo's engine.
I can post a video or a screenshot.VideoAzu2012-02-03 21:17:23