I could see that you ported 2 of our GuppY sample plugins scripts to E-xoops
So, these scripts are the Clock and this Mind guessing game
I must say that these scripts were themselves adapted from pure Javascripts embedded in some HTML page, sent to me by friends, unfortunately with no reference to whom developped them initially
c'est simple. soit X les unitées et Y les dizaines et Z le nombre en question prealablement choisi c'est valable ssi 10Y+X=Z-X-Y ==>9Y = Z les signes changent a chaque fois, et on est obliger de tomber sur un multiple de 9