The levels and their complexity have nothing to do with their numbering. For example, levels 2 and 3 are more difficult than levels 4 and 5馃檭. If it is difficult for you to pass a certain level, then skip it and go to the next level. I'm sorry that levels 2 and 3 turned out to be very difficult and "empty" 馃槄. I promise that the next levels will be more interesting.