▁ ▁S igma ▁Fl ush ▁Att ack ▁S igma ▁Fl ush ▁Att ack ▁is ▁a ▁combination ▁of ▁video ▁pok er ▁and ▁a ▁bank ing ▁slot , ▁in ▁this ▁case ▁what ▁is ▁being ▁bank ed ▁is ▁flush es . ▁After ▁ 3 , 4 , ▁or ▁ 5 ▁flush es ▁( var ies ▁by ▁machine ), ▁the ▁machine ▁switch es ▁into ▁" flush ▁attack ▁mode " ▁in ▁which ▁the ▁next ▁flush ▁pays ▁ 1 0 0 ▁or ▁ 1 2 5 ▁cred its ▁instead ▁of ▁the ▁more ▁usual ▁ 3 0 ▁cred its ▁of ▁ 9 - 6 ▁Jack s ▁or ▁Better . ▁Some ▁of ▁these ▁machines ▁are ▁linked , ▁which ▁means ▁players ▁can ▁simply ▁wait ▁for ▁someone ▁else ▁to ▁put ▁the ▁bank ▁in ▁flush ▁attack ▁mode , ▁or ▁altern ately ▁with ▁non - link ed ▁machines ▁a ▁player ▁can ▁play ▁after ▁obser ving ▁a ▁previous ▁player ▁hit ▁flush es ▁but ▁not ▁enough ▁to ▁trigger ▁the ▁flush ▁attack , ▁a ▁practice ▁called ▁" v ult uring ". ▁The ▁higher ▁pay off ▁of ▁the ▁flush ▁attack ▁represents ▁one ▁of ▁the ▁higher ▁over l ays ▁of ▁video ▁pok er . ▁These ▁machines , ▁once ▁common , ▁are ▁now ▁relatively ▁rare . ▁ ▁Bon us ▁P oker ▁" B on us ▁P oker " ▁is ▁a ▁video ▁pok er ▁game ▁based ▁on ▁Jack s ▁or ▁Better , ▁but ▁Bon us ▁P oker ▁offers ▁a ▁higher ▁p ayout ▁percentage ▁for ▁four ▁of ▁a ▁kind . ▁The ▁full - pay ▁version ▁of ▁this ▁game ▁returns ▁ 9 9 .