Go rummy
Go out in one turn without melding anything earlier, and the whole hand's total is doubled for you.

Rummy and melding · 2 to 6 players
Rummy is the classic: lay down sets and runs and be the first to empty your hand. When you go out, every card your opponents are still holding turns into points for you, so speed matters as much as luck.
Rummy is one of the 21 games in Cards Royale.

How it plays
Two players get ten cards each, three or four get seven, and five or six get six, with one card turned up to start the discard pile.
Draw from the stock or the pile, lay down any sets and runs you hold, lay off onto any meld on the table, then discard.
Only the player who goes out scores the cards left in the other hands, and play continues until someone reaches the target, 500 by default.
The moments you play for
A friendly table of two to six.
Go out in one turn without melding anything earlier, and the whole hand's total is doubled for you.
Once a meld is down it belongs to the table, so you can add your cards to anyone's sets and runs.
The card a player takes from the pile tells you what they are building, so think before you throw.
Screenshots
The same table on iPhone, iPad, Mac and the iPhone Duo. Scroll sideways to see them all.
iPhone
iPhone Duo, half open
iPhone Duo, unfolded
iPhone Duo, folded
iPad, landscape
iPad, portrait
MacRummy and melding