Barrent looked over his opponent. It was a glistening black machine shaped like a half-sphere, standing almost four feet high. It rolled restlessly back and forth on small wheels. A pattern of red, green, and amber lights from recessed glass bulbs flashed across its smooth metal hide. It stirred in Barrent a vague memory of some creature from Earth's oceans. "For the benefit of those who are visiting our gallery for the first time," the loudspeaker said, "a word of explanation is in order. The prisoner, Will Barrent, has freely chosen the Trial by Ordeal. The instrument of justice, which in this instance is GME 213, is an example of the finest creative engineering which Omega has produced. The machine, or Max, as its many friends and admirers call it, is a murder weapon of exemplary efficiency, able to utilize no less than twenty-three killing modes, many of them extremely painful. For trial purposes, it is set to operate upon a random principle. This means that Max has no choice over the way in which it kills. The modes are selected and abandoned by a random arrangement of twenty-three numbers, linked to an equally random time-selection of one to six seconds." Max suddenly moved toward the center of the room, and Barrent backed away from it. "It is within the prisoner's power," the loudspeaker voice continued, "to disable the machine; in which case, the prisoner wins the contest and is set free with full rights and privileges of his station. The method of disabling varies from machine to machine. It is always theoretically possible for a prisoner to win. Practically speaking, this has happened on an average of 3.5 times out of a hundred." Barrent looked up at the gallery of spectators. To judge by their dress, they were all men and women of status; high in the ranks of the Privileged Classes. Then he saw, sitting in a front row seat, the girl who had lent him her gun on his first day in Tetrahyde. She was as beautiful as he had remembered her; but no hint of emotion touched her pale, oval face. She stared at him with the frank and detached interest of someone watching an unusual bug under a jar. "Let the contest begin!" the loudspeaker announced. Barrent had no more time to think about the girl, for the machine was rolling toward him. He circled warily away from it. Max extruded a single slender tentacle with a white light winking in the end of it The machine rolled toward Barrent, backing him toward a wall. Abruptly it stopped. Barrent heard the clank of gears. The tentacle was withdrawn, and in its place appeared a jointed metal arm which ended in a knife-edge. Moving more quickly now, the machine cornered him against the wall. The arm flickered out, but Barrent managed to dodge it. He heard the knife-edge scrape against stone. When the arm withdrew, Barrent had a chance to move again into the center of the room.