The earliest known manual written about dominoes is the Manual of the Xuanhe Period () written by Qu You (1341–1427), but some Chinese scholars believe this manual is a forgery from a later time.
The oldest documented manual on dominoes, the "Manual of the Xuanhe Period," was written by Qu You (1341-1427). However, there is debate among Chinese scholars about its authenticity and whether it's a genuine work from that period or a later forgery.