levels.json

{
   "levels": [
      {
         "level_num": 1,
         "plant_type": 0,
         "color_scheme": 0,
         "num_waves": 3,
         "waves": [
            {
               "wave_num": 1,
               "centipedes": [
                  {
                     "centipede_num": 1,
                     "segments": 10,
                     "speed": 0.15,
                     "head_speed": 0.05
                  },
                  {
                     "centipede_num": 2,
                     "segments": 10,
                     "speed": 0.15,
                     "head_speed": 0.05,
                     "time": 30
                  }
               ]
            },
            {
               "wave_num": 2,
               "butterflies": [
                  {
                     "butterfly_num", 1,
                     "count": 5,
                     "speed": 0.5
                  }
               ]
            }
         ]
      }
   ]
}