anchor.diff:  
       // render boss sprite: Minotaur
       boss = game.add.sprite(game.world.centerX+150, game.world.centerY, 'boss');
  -
   
       // setup slimes group
       slimes = []
  
positive.code: 
    // create things in the game environment
    function create() {
  
      // set environment bounds
      game.world.setBounds(0, 0, 600, 600);
  
  
negative.code: 
      // set up custom animations using .gif or .png spritesheet
      knight.animations.add('walkDown', [3,4,5,4]);
      knight.animations.add('attackDown', [6, 7, 8, 3]);
      knight.animations.add('walkLeft', [12,13,14,13]);
      knight.animations.add('attackLeft', [15, 16, 17, 12]);
      knight.animations.add('walkRight', [21,22,23,22]);
      knight.animations.add('attackRight', [24, 25, 26, 21]);
      knight.animations.add('walkUp', [30,31,32,31]);
      knight.animations.add('attackUp', [33, 34, 35, 30]);
      knight.animations.add('victorious', [1, 1, 1, 6, 7, 16, 34, 25, 6, 7, 7, 8]);
      knight.animations.add('spin', [1, 10, 28, 19, 1]);
  
      // set up custom boss animations for each sprite
      boss.animations.add('rise', [ 0, 0, 1, 1, 3, 3, 3, 3, 9, 8, 9, 8, 9, 8, 9, 8, 9, 8, 10, 10, 10, 10, 10, 10, 4, 3, 2, 5]);
      boss.animations.add('neutral', [4]);
      boss.animations.add('flinch', [7, 7, 3, 8, 9, 10]);
      boss.animations.add('die', [7, 6, 8, 9, 8, 9, 8, 7, 1, 0, 0]);
  
      // opening animations
      knight.animations.play('spin', 7, false);
      boss.animations.play('rise', 10, false);
    }
  
    // update game environment
    function update() {
  