What you can do on a turn
Draw one card from the stock or take the upcard, then discard one card. You cannot discard the upcard you just took. Knock, instead of a face-up discard, when the 10 cards you keep are worth 10 or less.
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Gin Rummy
How to Play Gin Rummy
Gin Rummy is a two-player melding game. Draw one card, discard one, and knock when the unmatched cards you keep total 10 points or less.
If you already play Crazy Eights, the shared discard will feel familiar, but Gin is won by knocking, not by emptying your hand. After a knock, the lower deadwood scores the difference, gin adds 25, and an undercut adds 10.
How a hand is scored
The lower deadwood scores the difference. Gin, which is 0 deadwood, adds 25 and blocks layoffs. If the knocker is equal or higher, the opponent scores the difference plus 10 for the undercut.
If you want a deeper understanding of the rules review the full How to Play Gin Rummy guide.
Tips and Tricks
How Gin Rummy Scoring Works
Deadwood, knock, gin, undercut, boxes, and the race to 100 the way Solitaire Arcade counts Gin Rummy.
Gin Rummy Strategy: When to Knock
When to knock in Gin Rummy: read the deadwood count, watch what they pick up, and know when waiting for gin costs the hand.
Gin Rummy vs Rummy: What's the Difference?
Basic Rummy lays melds face up and empties the hand. Gin Rummy keeps them private until a knock. Same sets and runs, different finish.