The point of the game is to connect as much blocks as possible using swipe and destroy other blocks to get the highest score. Each block that connected to the pile increases pile's points exponantially.And if you manage to connect all the blocks of one kind you started with, score of that pile will be doubled.You can not destroy standalone blocks.Each level has a minimum score point you must reach in order to unlock the next level in challenge mode.As you progress in Challenge Mode,difficulty increases like limitations to the moves you can make gets restricted, e.g. only allowed to swipe up. Try it out,Have Fun!