cases 1st division winnings can build up to about HKD$100 million (compared to the normal HKD$8 million 1st division prize), as seen several times in 2004, 2005, 2016. For each draw, a certain percentage (see below for details) of the entry money is deducted and placed into a Snowball Pool. On selected draws, the Snowball Pool is added to the 1st division prize as well. These draws are known as Snowball Draws (金多寶). The HKJC decides which draws are snowball draws. Usually the date is chosen to match a public holiday or festival, and the draw is named accordingly. These draws are very popular due to their large 1st division prizes. Each unit of numbers costs HK$10, which, following a big price cut in 1976 and subsequent price increases over the years, is at the same level as when the first drawing was held in 1975. Prize Prize allocations are governed by rules established by HKJC Lotteries, which operates the Mark Six lottery. Prizes for 1st to 3rd division wins are calculated based on a complex formula, with a guaranteed minimum prize fund for 1st division prizes. Prizes below 3rd division wins are fixed at a certain amount, and do not change. Notes Drawings Since 2004, Mark Six drawings are held three times a week, on Tuesday, Thursday, and either Saturday or Sunday. Weekend drawings began in September 2003, with drawings held on Saturdays with no horse races scheduled. That arrangement was later expanded to include both Saturdays and Sundays, to be held on a day with no horse races scheduled. There is a precedent for HKJC officials to delay Mark Six drawings when there is a big accumulated jackpot (), so as to allow people extra time to buy a ticket. Drawings have also been delayed due to computer errors at betting stations that prevent tickets from being sold. Since the first Mark Six drawing, HKJC has used four different generation of lottery machines to draw the winning numbers. The first machine was flown in to Hong Kong from (Germany), while the current machine, in use since November 2010, is made by US-based Smartplay International. Fairness To ensure the draw's fairness, a number of measures are taken. Employees with HKJC's security and customer service departments will strictly check and test all materials used for the draw, from boxing to transport. Balls used in the draw are also measured, weighed,