doubleTheNums.js

function doubleTheNums(obj) {
  const keys = Object.keys(obj)
  
  for (let index = 0; index < keys.length; index++) {
    const key = keys[index]
    const value = obj[key]
    if (typeof value === 'number') {
      obj[key] = obj[key] * 2
    } else if (value && typeof value === 'object') {
      doubleTheNums(obj[key])
    }
  }
  return obj
}

const results = {
  game1: {
    lakers: 40,
    celtics: 40,
    overtime: {
      lakers: 48,
      celtics: 58,
    },
  },
  game2: {
    lakers: 40,
    celtics: 21,
  },
  game3: {
    lakers: 12,
    celtics: 29,
  },
}

console.log(doubleTheNums(results))