Along with 13 cards rummy, 21 cards Rummy is also one of the most popular rummy card games in India. 21 cards rummy game is also known as the Indian marriage & played during major festivals. It is most exciting & played for a longer duration than classic rummy. 21 card rummy is a bit similar to 13 cards rummy, the difference is, in 13 decks are used here instead of 2 decks. Each player is given 21 cards and they should construct 3 decks and group the cards into pure sequences and valid sets.