read the script carefully
quiz_01,204,93,6 script Dice#dc001 715,{//--------------------------------------------------OnInit: set .evt_reward_item,505; set .rtrn_map$,"prontera"; set .rtrn_x,113; set .rtrn_y,97; set $@dice_event,1; end; // <-- END !! if($@dice_event==2&&getusers(0)==1){ mes "[Mr. Dice]"; mes "Congrats. You've won."; getitem .evt_reward_item,rand(1,20); close2; announce "We have a winner! well done "+strcharinfo(0)+".",0; set $@dice_event,0; warp .rtrn_map$,.rtrn_x,.rtrn_y; disablenpc "Dice#dc001"; } end;btw this script is very unoptimized ...for example, I also found the reward npc also not poping up when play for 2nd round ... etc etc