Abstract: The invention relates to a simulator (10) for training at least one person, comprising a training room (20), the inner delimiting surface of which is provided with a color suitable for a color-based picture knock-out, wherein the simulator (10) comprises at least one semi-transparent head-mounted display (21; 21?), which is provided with two video cameras for stereoscopic images and a head tracker, which allows the line of sight of the respective wearer to be ascertained. The simulator (10) further comprises a simulation processor (22) having two picture generators for a stereoscopic representation of virtual pictures on the at least one head-mounted display (21; 21?), and the virtual pictures to be represented can be generated by a video mixer, which comprises means for isochronously mixing the images of the video cameras of the at least one head-mounted display (21, 21?) with computed virtual pictures in the respective line of sight.