(CNN) -- Demand for tickets for the 2012 Olympics in London hit fever pitch ahead of Tuesday's deadline, according to organizers.
The six-week window for the public to apply for 6.6 million tickets available for 26 sports across 17 days of competition was to close at 2259 GMT.
"Applications have been steady but at a high level, which is in line with operational expectations, but this week it has hit the roof," 2012 chief executive Paul Deighton told the UK Press Association.
"Every day we have got a massive number of orders, which is not surprising, because people have taken on board that it's not a first-come, first-served system. They have sat down with their families to decide what they want.
"Since last Friday, we have seen a high level go to a really high level. In the last week we have been getting three or four times the applications above and beyond what was coming in for the previous five weeks."
Prices range from £20 ($30) to £2,012 (£3,300) for premier events such as the opening ceremony -- which is expected to be one of the sessions that will go to a ballot due to demand exceeding supply.
Those who successfully apply for tickets will be notified by June 24.
Deighton said the ticketing system had so far coped well with the numbers of people applying, with more than 2.5 million having signed up before sales began on March 15.
"The system has actually worked faultlessly, and with a process of this scale and complexity that is extraordinary," he told PA.
"Even though I am expecting we will have significant demand, we are confident with the way the system is working and that it can support anything that the ticket-buying world can throw at us.
"There will be a number of tickets left over. It was always the plan."
Two million tickets for the 2012 Paralympics also in London will become available in a similar ballot starting on September 9 and finishing that month.