Hnefatafl (sometimes now referred to as "Viking Chess") was a popular game in medieval Scandinavia and was mentioned in several of the Norse Sagas. Some of these saga references have contributed to controversy over the possible use of dice in playing hnefatafl. The rules of the game were never explicitly recorded, and only playing pieces and fragmentary boards are extant, so it is not known for sure how the game was played. If dice were in fact used, nothing has been recorded about how they were employed. Archaeological and literary sources indicate Hnefatafl may have been played on a 13×13 or an 11×11 board.