Do the levels just repeat the same game?

I'm at level 762, and I've noticed slight differences as I get higher. For example, for awhile I had a red tile that would add 15-20 new tiles once you matched it, making the game longer. Now I have two tiles that could out and blow trumpets and clear the Board when I'm only half way through the level. Also, my husband, who I passed and is about 200 levels behind me didn't get all of the unique things (like the trumpet blowing tiles) that I did. Go figure. I guess the game is slightly different for each person?