Power Snooker 30 minute game play period, with the balls being continually re-racked. The winner is the player who has scored more cumulative points by the end of the fixed game play period, with ties settled with a single . The 30 minute game clock is halted between frames. Also unlike traditional Snooker, which uses 15 racked in a triangle shape, Power Snooker matches use just nine red balls in a diamond shape. Basic play in Power Snooker is scored in the same way as traditional snooker. On the shot however, the starting player keeps his turn at the table as long
The Seven Crystal Balls adventures, which had actually been authored later than "The Seven Crystal Balls", in the English version, references are made to events that would occur in "The Calculus Affair" and "The Red Sea Sharks". Biographer Benoît Peeters described "The Seven Crystal Balls" as "the most terrifying of "The Adventures of Tintin"". He believed that in this story, Hergé had come under the clear influence of Jacobs, in that the "décor grows more lush; the details clearer. No more streets suggested by a few lines, monochromatic posters, or characters walking on the edge of the frame." Elsewhere, he noted that in this