Sugoroku

Sugoroku (双六?) refers to two different forms of Japanese board game, one similar to western backgammon, called ban-sugoroku, and the other similar to western Snakes and ladders. Sugoroku plays identically to backgammon (it even has the same starting position), except for the following differences:

• Doubles are not special. If a player rolls doubles, each die still counts only once.
• There is no "bearing off". The goal is to move all of one's men to within the last six spaces of the board.
• There is no doubling cube.
• It is not permitted to form a prime of six contiguous points to obstruct one's opponent.