Fun in the beginning but as you progress it becomes more difficult and eventually impossible. The developers are greedy, constantly going back to change levels to make them impossible to play without paying for boosters. You can find videos about how to pass levels, when you look at them you will see these levels always have way more moves and way less obstacles. I am on level 10209, but I am giving up. Playing is no longer fun, it's boring and frustrating. King, you really suck.