It is the one day of the year when Australians can enjoy a game of two-up, as pubs around the country host games in commemoration of Anzac Day.

Typically two-up is only allowed on one day a year, April 25, after midday so it is your chance to be a part of the fun.

And judging by videos posted on social media today, Australians are turning out in their record numbers.

The lines waiting for the London Pub in Paddington on Anzac Day.

The London pub in Paddington, Sydney, is hosting a street party for the first time and a huge queue, five-to-six-people wide stretched around the block by 8.40am this morning with only walk-ins guaranteed entry.

The startling footage was captured by Instagram account Bondi Lines.

Huge lines for the Clovelly Hotel in the Eastern Suburbs were also captured.

How two-up works

At its most basic level, the game involves one person tossing up two coins and people in the crowd betting on the outcome.

The outcomes are either two heads, two tails or "odds", which is one of each.

Generally you can only bet on either heads or tails, and continue tossing up until you get a result.

Some venues will allow bets on odds.

The Great Club in Marrickville said they won't be going ahead with their two-up event on Anzac Day.

The spinner will make a bet with someone in the crowd and then tosses the coins in the air, making sure they travel at least three metres in the air and land inside the ring.

Money is then exchanged depending on who won the bet.

Several bets are made among people in the crowd or "school" as it's known, and the whole game is run by the "boxer" who stands in the middle but does not bet.

It's the boxer's job to ensure all bets are paid and people are playing fairly.

They also have discretion when it comes to weak tosses, so make sure to get those coins nice and high.

The wooden paddle used to toss the coins is called the "kip".

The coins are always pennies from before 1939.

In most clubs you will find people betting in $5, $10 and $20 sums but you may find eager punters willing to wager a $50.

But the most important thing to remember when you're having a beer and tossing up the coins is the men and women who sacrificed their lives to make that moment possible.

Incredible scenes as Aussies flock to two-up games