Gin Rummy is a card game with object to form melds which are three or four cards of the same rank (such as 7-7-7, or a run of three or more cards of consecutive rank in the same suit (such as 8-7-6-5 of heart) . Ace is counted as one. All face cards are counted as 10. Other cards are counted as their face value. The beauty of this game is to play against a robot, and you have an option to see how it plays.
When the game ends, the player with minimum points of non-meld cards wins.

You are assigned as the dealer for the first game. You deal the first card face down to your opponent and then one card to yourself until each player has 10 cards, then the next card face up on the table, and the remaining pack face down on the table as stock cards

The non dealer first has the option to take the up card or pass, if pass then you has the option to take the up card or pass. If a player takes the up card, he/she has to discard one card face up from his/her hand onto the table. On successive play, each player has an option to either take the latest up card or a face down card from the stock and then discard one card face up from its hand covering the last face up card on the table.

When a player holds less than than 10 points of deadwood (cards not part of a meld) after discarding, he is eligible to “knock” to end the game and both players show down their hands. A player with a lower points of all deadwood cards in his/her hand earn the score of the difference of deadwood points between the two hands. If the knocker wins and has no deadwood in its hand, he/she wins an additional bonus score of 25. If the non-knocker wins he/she earn an “undercut” bonus score of 25. The game is a draw if each player has equal deadwood points or neither one can “knock” and there are only two cards left in the stock cards.
Who wins a game becomes the dealer of the next game. When a player has a total score reaching the match limit, the match ends.
To play the game:-
1.1) On the Welcome page, you click the See Opp's button to see how the robotic opponent play its hand. Otherwise you either click button Start 100, Start 200, or Start 300 for a match with score limit at 100, 200, and 300 respectively.
1.2) You are assigned as the dealer in the first game.
1.3) The robotic player will either pass or take up the first face up card. If it takes the the face up card, it discards a card from its hand face up to the table.
1.4) If the robotic player passes the first face up card, you have the option to take it by clicking the Take Up button, or pass it by clicking the Pass button. If you take the up-card, you have to discard one card from your hand by first input the card number from 1 to 10 and then click button Drop.
1.5) It's then your opponent's turn to play. When it's your turn again, this time you has an option to either take one card from the face up pile or the face down stock cards by clicking button Take Up or Take Down.
1.6) When you have deadwood cards total point less than 10 points after discarding one card, you then input the card number to discard ( 1-11) and then click button DropKnock to knock, or you can keep on playing by clicking button Drop.
1.7) The system will calculate and display the deadwood and score of each hand and the total score of the match so far. You then click menu option Next to play next hand.
1.8) To play a new game option, click menu option Home to go the Welcome page and then click a new menu option.