In Star Plus, players want to rid themselves of cards, but they can't just play anything that they want. No, the cards much be played in turn from 1-12 into the center of the table, then players start with 1 again. You can play a single card that matches the number that should be played on your turn, or you can play multiple cards that sum to the number needed. If you can't play the required number, then you need to draw cards from the deck.
If someone plays three or more cards at the same time — a star boom! — then the next player must play a star boom as well or else draw cards.
When someone voids their hand, players tally their points for cards played.