Towers of Hanoi in scala

towers.scala

class TowersOfHanoi {
  def Play(towers: List[List[Int]] = List(List(1, 2, 3), List[Int](), List[Int]())) {
    Display(towers)
    if(GameOver(towers)) {
      println("You win!")
      return
    }
    val from = GetMoveTower("Pick a from tower");
    val to = GetMoveTower("Pick a to tower");
    val moveResult = Move(from, to, towers)
    Play(moveResult)
  }

  def Move(from: Int, to: Int, towers: List[List[Int]]): List[List[Int]] = {
    if(!CanMove(from, to, towers)) {
      println("Can't move there")
      return towers
    }

    val disk = towers(from).head
    var i = 0;
    towers.foldLeft(List[List[Int]]())((r, l) =>
      if (i == from) {
        i += 1;
        r ::: List(l.tail);
      } else if (i == to) {
        i+= 1;
        r ::: List(List(disk) ::: l);
      } else {
        i+= 1;
        r ::: List(l);
      }
    )
  }

  def CanMove(from: Int, to: Int, towers: List[List[Int]]): Boolean = {
    towers(to).length == 0 || towers(from).head  < towers(to).head
  }

  def GameOver(towers: List[List[Int]]) : Boolean = {
    towers(0).length == 0 && towers(2).length == 3
  }

  def Display(towers: List[List[Int]]) {
    println(towers(0));
    println(towers(1));
    println(towers(2));
  }

  def GetMoveTower(message: String) : Int = {
    println(message)
    readInt
  }
}

val game = new TowersOfHanoi()
game.Play()

[Bug Fix] Change line 37 to: towers(from).length > 0 && (towers(to).length == 0 || towers(from).head < towers(to).head)