Gin Rummy is a form of the rummy game where players place cards into sets and runs.
The object of the game is to collect a hand where most or all of the cards can be combined into sets and runs and the point value of the remaining unmatched cards is low.
Note that in Gin Rummy the Ace is always low. A-2-3 is a valid sequence but A-K-Q is not.
You can place mate sets or run sets in the red bordered boxes above your cards to better organize your hand.