{
  "game": "pump",
  "displayName": "Pump",
  "rtpPercent": 99.0,
  "rtpE8": 99000000,
  "engine": "uint32",
  "biasClass": "uniform",
  "params": [
    {
      "name": "difficulty",
      "desc": "easy/medium/hard/expert"
    },
    {
      "name": "pumps",
      "desc": "pumps made"
    }
  ],
  "slots": 25,
  "difficulty": {
    "easy": {
      "pops": 1
    },
    "medium": {
      "pops": 3
    },
    "hard": {
      "pops": 5
    },
    "expert": {
      "pops": 10
    }
  },
  "note": "pop-set = shuffle(25)[:pops]; pump slots 0..k−1 until a pop index is hit; multiplier = rtp·∏(25−i)/(25−pops−i)."
}