London rummy is a rummy variation that is popular in the United Kingdom and is also known as Kalooki. London Rummy is different from Indian Rummy as it features an extra rule known as coming down.
As per this rule, when the total value of your melds reaches 40 or more, players have the choice to lay those cards face up on the table as declared sets. This method is called Coming Down. When you play London Rummy games, choosing to come down reduces your penalty points in your current hand and you may decide to do so any time.
Another rule of London rummy games dictates a certain term. When you choose to draw a card from the discard pile, you need to use this card within a set immediately and place the set face up on the table.