Selfish. Just as when you're getting the hang of it, it shuts you down for no sound reason. Waste of time. Mind you, my top score is on the top 20 all time. Then the program starts to be unfriendly in a harsh manner. It slap shuts your inner core. Makes you feel depressed from how cruel they have made their so-called random blocks. Because its not random and it's out to shut you down like, right now ! Not challenging, there's a difference. One more time, A waste of time. I'm de'apping. Bye bye.