, ▁but ▁rather ▁a ▁" tr ick " ▁that ▁was ▁created ▁by ▁game ▁developers . ▁A ▁trick ▁used ▁in ▁Duke ▁N uk em ▁ 3 D ▁to ▁get ▁around ▁this , ▁as ▁in ▁the ▁case ▁of ▁its ▁op aque ▁under water ▁sections , ▁was ▁to ▁simply ▁transport ▁the ▁player ▁quickly ▁to ▁another ▁region ▁of ▁the ▁map ▁made ▁to ▁m im ic ▁it , ▁similar ▁to ▁the ▁elev ators ▁from ▁R ise ▁of ▁the ▁Tri ad . ▁ ▁In ▁ 2 0 1 1 , ▁a ▁feature ▁was ▁added ▁to ▁ED u ke 3 2 ▁called ▁true ▁room ▁over ▁room ▁( T ROR ), ▁which ▁allows ▁multiple ▁se ctors ▁to ▁be ▁stack ed ▁vert ically ▁so ▁that ▁each ▁sector ' s ▁wall ▁has ▁its ▁own ▁connection , ▁en abling ▁vert ically - un rest rict ed ▁structures . ▁The ▁difference ▁between ▁R OR ▁and ▁T ROR ▁is ▁that ▁T ROR ▁se ctors ▁phys ically ▁overlap ▁in ▁the ▁map ▁data ▁and ▁editor ▁( allow ing ▁for ▁easy ▁creation ▁and ▁visual ization ), ▁rather ▁than ▁being ▁drawn ▁from ▁separate ▁locations ▁using ▁view ▁port als , ▁hence ▁true ▁room ▁over ▁room . ▁T ROR ▁is ▁a ▁feature ▁of ▁the ▁ED u ke 3 2 ▁source ▁port , ▁not ▁a ▁game ▁feature ▁or ▁trick . ▁ ▁Build ▁engine ▁games ▁▁ ▁Games ▁that ▁are ▁built ▁directly ▁on ▁the ▁Build ▁engine ▁ ▁Leg end ▁of ▁the ▁Seven ▁Pal ad ins ▁( 1 9 9 4 ) ▁( comple ted ▁but ▁only ▁released ▁locally , ▁a ▁le aked ▁copy ▁exists ▁on