 Pssst was one of the few Spectrum games also available in ROM format for use with the Interface 2 , allowing " instantaneous " loading of the game when the normal method of cassette loading could take several minutes . The game used the common technique of placing planar sprites with image sprites atop another , which often created graphical errors and overlapped colours on the console . Pssst was also able to run on the 16K version of the Spectrum . 
