Seeds to get the same pieces every time
I like playing Quadrapassel but it's sort of hard to compete with another person because you won't get the same pieces as that person. So I suggest you add an option where you can enter a seed, a string of text and then it will generate a infinitely long series of pieces to give you that will be the same every time you use that seed. Then, you could compete easily with another person just by sharing a string of text. This would be super fun. :)