Once everyone has played, you'll count up the points of the cards you've played. For any cards you cannot play, you will subtract them. You cannot score below zero in a round, and words must consist of at least 2 cards. Each round there will also be 10 bonus points for the longest word and 10 points for the most words, none for ties.
After the round of 3 cards, you'll play a round of 4 cards. Keep playing like this until you complete the round of 10 cards. That's it! Most points wins.