{
  "name": "acid_eats_through_wall",
  "description": "Acid dissolves a thin wood wall",
  "seed": 42,
  "init_mode": "empty",
  "setup": [
    {"type": "fill_rect", "x": 100, "y": 125, "w": 20, "h": 1, "material": "stone"},
    {"type": "set_cell", "x": 108, "y": 124, "material": "wood"},
    {"type": "set_cell", "x": 108, "y": 123, "material": "wood"},
    {"type": "fill_rect", "x": 100, "y": 123, "w": 8, "h": 2, "material": "acid"}
  ],
  "steps": 40,
  "assertions": [
    {"type": "no_material_in_region", "x": 107, "y": 122, "w": 3, "h": 4, "material": "wood"}
  ]
}