{
  "name": "lava_pool_interaction",
  "description": "Lava pool cools when water is poured on it",
  "seed": 42,
  "init_mode": "empty",
  "setup": [
    {"type": "fill_rect", "x": 100, "y": 125, "w": 20, "h": 3, "material": "stone"},
    {"type": "fill_rect", "x": 102, "y": 122, "w": 6, "h": 3, "material": "lava"},
    {"type": "fill_rect", "x": 110, "y": 122, "w": 6, "h": 3, "material": "water"}
  ],
  "steps": 120,
  "assertions": [
    {"type": "material_count_in_region", "x": 100, "y": 118, "w": 20, "h": 10, "material": "stone", "min": 10, "max": 100}
  ]
}