Playing around with maps

treasureMap.scala

import java.io.{BufferedReader, InputStreamReader}
import scala.collection.mutable.Map
object Main {
  def main(args: Array[String]) {
    println("Welcome. What key shall we use?")
    val key = readLine()
    //val key2 = key + \n
    println("And what shall it unlock?")
    val unlock = readLine()
    val treasureMap = Map[String, String]()
    treasureMap += (key -> unlock)
    treasureMap += ("Second" -> "Find big X on ground.\n")
    treasureMap += ("Third" -> "Dig.\n")
    //println(treasureMap(key))
    println("What key do you want to use?")
    val use = readLine()
    treasureMap(use)
  }
}