y ▁tri - fold ▁bo ards ▁with ▁the ▁most ▁frequently ▁used ▁tables ▁printed ▁on ▁them ▁for ▁easy ▁reference . ▁The ▁ 1 9 7 9 ▁second ▁edition ▁of ▁the ▁screen ▁describes ▁its ▁purpose ▁as ▁" use ful ▁for ▁shield ing ▁maps ▁and ▁other ▁game ▁materials ▁from ▁the ▁players ▁when ▁placed ▁u pr ight , ▁and ▁also ▁provide [ s ] ▁instant ▁reference ▁to ▁the ▁charts ▁and ▁tables ▁most ▁commonly ▁used ▁during ▁play ." ▁The ▁Advanced ▁Dun ge ons ▁& ▁Drag ons ▁Second ▁Edition ▁screen ▁came ▁pack aged ▁with ▁a ▁brief ▁advent ure ; ▁later ▁ed itions ▁of ▁that ▁screen , ▁and ▁screens ▁produced ▁for ▁later ▁ed itions , ▁have ▁instead ▁included ▁character ▁sheets ▁and ▁general ▁reference ▁book lets . ▁ ▁A ▁feature ▁of ▁the ▁first ▁edition ▁Dun geon ▁Masters ▁Guide ▁was ▁the ▁random ▁d unge on ▁generator . ▁The ▁generator ▁allowed ▁the ▁Dun geon ▁Master , ▁by ▁the ▁rolling ▁of ▁dice , ▁to ▁generate ▁a ▁d unge on ▁advent ure ▁" on ▁the ▁fly ". ▁A ▁d unge on ▁complete ▁with ▁passage ways , ▁rooms , ▁tre asure , ▁mon sters , ▁and ▁other ▁enc oun ters ▁could ▁easily ▁and ▁randomly ▁be ▁constructed ▁as ▁the ▁player ▁progress ed . ▁It ▁could ▁be ▁used ▁with ▁several ▁people ▁or ▁a ▁single ▁player . ▁The ▁generator ▁was ▁not ▁included ▁in ▁subsequent ▁ed itions ▁of ▁the ▁Dun geon ▁Master ' s ▁Guide ▁but ▁made ▁a ▁re - app earance ▁in ▁the ▁fifth ▁edition ▁Dun geon ▁Master ' s ▁Guide . ▁ ▁The ▁original ▁Dun geon ▁Masters ▁Guide