Escape from Monster Manor(1993)

The undead have been unleashed upon the world. Only a holy talisman can destroy them, but it has been broken into pieces and hidden in Monster Manor. Now you must venture into the cursed mansion and find the pieces so that humanity may be saved. The game is a first-person-shooter where you have to destroy enemies like ghosts, skeletons and zombies using your only gun. Items scattered around the house include health packs, gun energy, treasure and keys that are used to open doors that block your way to the next talisman piece. The game has twelve levels.