There are 20 different contestants in total. Each contestant is very similar in height and weight, although they are different in appearance. The weight difference between the 20 contestants is 0.62 grams at most and the diameter difference is 0.69 millimeters at most. Past performances of contestants are included under their profiles in the contestants section.
10 contests are held every day. Each competition has 20 contestants.
The whole system was made completely transparent, only the finish flat was carved woodwork to ensure that no tricks were introduced into the competition.
In case of a possible situation, the measures are taken and determined by the rules in advance. An immediate response is made by the referee to a possible jam or obstruction.