anchor.diff:  part of escape;
   
  -class Board extends Sprite {
  +class Board extends ViewportContainer {
   
                         // LEVEL |  1 |  2 |  3 |  4 |  5 |  6 |  7 | ++
                         //-------|------------------------------------------
  
positive.code: 
    void dropFields() {
  
      this.mask = new Mask.rectangle(0.0, 0.0, 500.0, 500.0);
  
      for(int y = 0; y < 10; y++) {
        for(int x = 0; x < 10; x++) {
  
negative.code: 
      ValueCounter completeCounter = new ValueCounter();
  
      //this.mask = new Mask.rectangle(0.0, 0.0, 500.0, 500.0);
      this.viewport = new Rectangle(0, 0, 500, 500);
  
      for(int x = 0; x < 10; x++) {
        for(int y = 0; y < 10; y++) {
  