To really get how this card game works, it's important to know the words people use when playing 21-card rummy, whether it's on the computer or in person.
1. Upper Joker - The "upper joker" is a card that's one step higher than the special joker card, but only if they're from the same group. For instance, if the special joker is the 4 of hearts, then the upper joker would be the 5 of hearts.
2. Lower Joker - The "lower joker" is a card that's one step lower than the special joker card, if they're from the same group. For example, if the special joker is the 6 of hearts, then the lower joker would be the 5 of hearts.
3. Tunnela - A "tunnela" is a set of three cards that are exactly the same, like having three 5 of hearts cards together. But you can't use a special Joker card to make a tunnela.
4. Dublee - A "dublee" is when you have two cards that are the same and from the same group, like two 7 of spades. You can also call two printed jokers a dublee.
5. Value cards - The "value cards" are cards from the same group that play the role of the upper and lower joker cards. Let's look at an example: if the special joker is the 9 of hearts, then the 8 of hearts is the lower joker and the 10 of hearts is the upper joker. All of these, 8, 9, and 10 of hearts, are value cards.
These are some really important words to understand before you start having fun playing 21-card rummy games!