ColorKu Expansion Pack Harder Levels

replacement balls for the Colorku game?

How many different "expansion" sets exist for Colorku?

Our original colorku board has cards that go from 1-104. do the extension packs start after 104? or are they repeats of what i already have?

Is this the same Expansion pack 2 for harder levels that I bought several years ago? If so, does anyone make a different harder level expansion pack?