Ozone vacuum-ultraviolet (VUV) ozone generators, employ a light source that generates a narrow-band ultraviolet light, a subset of that produced by the Sun. The Sun's UV sustains the ozone layer in the stratosphere of Earth. UV ozone generators use ambient air for ozone production, no air prep systems are used (air dryer or oxygen concentrator), therefore these generators tend to be less expensive. However UV ozone generators usually produce ozone with a concentration of about 0.5% or lower which limits the potential ozone production rate. Another disadvantage of this method is that it requires the ambient air (oxygen) to be exposed
The Mask of the Sun simple animations. "Softline" in 1983 noted the "innovative" animation and "excellent, detailed" graphics, and called the puzzles "very good". The magazine concluding that ""The Mask of the Sun" is a very good graphics adventure for the average to good adventurer". "Ahoy!" in 1984 liked "Mask of the Sun"s graphics and vocabulary but noted long load times and low level of difficulty, stating that even novice adventurers would be able to finish the game "within a couple of weeks". "Antic" called "Mask of the Sun"s graphics "absolutely superb" and the gameplay as "excellent". A sequel to The Mask of the Sun