T.scala

selectMaps($()).map { elem =>
      elem.map { jsValue =>
        jsValue.validate[Level].get
      }: List[Level]
    }.collect {
      case (list: List[Level]) => Ok(views.html.levelChooser(list))
    }

(for ( elem <- selectMaps($())
      jsValue <- elem
      valid <- jsValue.validate) yield valid) 
.map {list => Ok(views.html.levelChooser(list)) }