If you like games of traditional skill and intelligence, you will really enjoy this complicated variant called Open Alchemist.
In Open Alchemist you play the role of a crazy alchemist trying to correctly place each of the objects related to alchemy that fall from above. It isn`t enough to just group them to form a complete line (like in Tetris), instead you have to do it by colour; only when you get objects of the same colour together in threes will they disappear.
However, the objects never stop falling in Open Alchemist, so you have to be faster and more skillful as the game progresses so they don`t start accumulating and you lose everything.