anchor.diff:            'frog'
           ],
           drop: [
  -          chanceOf(25, 'Flower'),
  +          chanceOf(20, 'Flower'),
             chanceOf(50, 'food:1'),
             chanceOf(10, 'magic:1'),
  -          chanceOf(15, 'Stick')
  +          chanceOf(10, 'equipment:1'),
  +          chanceOf(10, 'Stick')
           ],
           quest: kill('fuzzy bunny', 1)),
         level(() => new Forest(meadowInset: 6), numMonsters: 8, numItems: 10,
  
positive.code:         ],
          drop: [
            chanceOf(60, 'food:2'),
            chanceOf(35, 'magic:2'),
            chanceOf(5, 'equipment:1')
          ],
          quest: kill('wild dog', 3)),
        level(() => new TrainingGrounds(), numMonsters: 16, numItems: 11,
  
negative.code:         ],
          drop: [
            chanceOf(55, 'food:3'),
            chanceOf(30, 'magic:2'),
            chanceOf(15, 'equipment:3')
          ],
          quest: kill('giant spider')),
        level(() => new TrainingGrounds(), numMonsters: 20, numItems: 12,
  