▁when ▁using ▁these ▁cards ). ▁Many ▁of ▁the ▁original ▁rules ▁applied ▁to ▁this ▁new ▁version ▁( in ▁fact , ▁one ▁optional ▁play ▁choice ▁allows ▁for ▁playing ▁in ▁the ▁original ▁form ▁by ▁only ▁adding ▁the ▁" Ad v ance ▁to ▁Stock ▁Exchange " ▁cards ▁to ▁each ▁deck ). ▁ ▁A ▁Mon opol y ▁Stock ▁Exchange ▁Edition ▁was ▁released ▁in ▁ 2 0 0 1 ▁( although ▁not ▁in ▁the ▁U . S .), ▁this ▁time ▁adding ▁an ▁electronic ▁calcul ator - like ▁device ▁to ▁keep ▁track ▁of ▁the ▁complex ▁stock ▁figures . ▁This ▁was ▁a ▁full ▁edition , ▁not ▁just ▁an ▁add - on , ▁that ▁came ▁with ▁its ▁own ▁board , ▁money ▁and ▁playing ▁pieces . ▁Properties ▁on ▁the ▁board ▁were ▁replaced ▁by ▁companies ▁on ▁which ▁shares ▁could ▁be ▁flo ated , ▁and ▁offices ▁and ▁home ▁offices ▁( inst ead ▁of ▁houses ▁and ▁hot els ) ▁could ▁be ▁built . ▁ ▁Play master ▁Play master , ▁another ▁official ▁add - on , ▁released ▁in ▁ 1 9 8 2 , ▁is ▁an ▁electronic ▁device ▁that ▁keeps ▁track ▁of ▁all ▁player ▁movement ▁and ▁dice ▁roll s ▁as ▁well ▁as ▁what ▁properties ▁are ▁still ▁available . ▁It ▁then ▁uses ▁this ▁information ▁to ▁call ▁random ▁au ctions ▁and ▁mort g ages ▁making ▁it ▁easier ▁to ▁free ▁up ▁cards ▁of ▁a ▁color ▁group . ▁It ▁also ▁plays ▁eight ▁short ▁t unes ▁when ▁key ▁game ▁functions ▁occur ; ▁for ▁example ▁when ▁a ▁player ▁lands ▁on ▁a ▁rail road ▁it ▁plays ▁" I ' ve ▁Be en ▁Working ▁on