Context: Modern commercial computer games use a number of different stimuli to assist players in locating key objects in the presented Virtual Environment (VE). These stimuli range from visual to auditory, and are employed in VEs depending on several factors such as gameplay design and aesthetics. Objectives: This study compares three different localization aids in order to evaluate their effectiveness in VEs. Method: An experiment is carried out in which testplayers are tasked with using audio signals, visual input, as well as a combination of both to correctly identify objects in a virtual scene. Results: Results gained from the experiment show how long testplayers spent on tests which made use of different stimuli. Upon analyzing the data, it was found that that audio stimulus was the slowest localization aid, and that visual stimulus and the combination of visual and auditory stimulus were tied for the fastest localization aid. Conclusions: The study concludes that there is a significant difference in efficiency among different localization aids and VEs of varied visual complexity, under the condition that the testplayer is familiar with each stimuli. / 3D-ljud och visuella hjälpmedel är vanliga i moderna datorspel. I denna uppsats detaljeras en studie kring effektivitet vid använding av 3D-ljud och visuella hjälpmedel i tre-dimensionella miljöer. Studien använder sig av en experimentiell design där testspelare får sitta i ett datorspel-liknande upplägg och använda sig av visuella och auditoriska hjälpmedel för att identifiera objekt i dessa miljöer. Studien bekräftar att det finns en signifikant skillnad i effektivitet mellan olika visuella och auditoriska hjälpmedel i tre-dimensionella miljöer.