Skyjo - How to Play

About Skyjo, from BoardGameGeek:

Every player has 12 hidden cards (3x4). Two are turned face up. On your turn, you can take the top card from the discard or draw pile. You can exchange one card (hidden or open) from your display. The round ends when one player has only open cards. (equal turns). All cards will be revealed. Add the numbers of the card for scoring. The game ends after one player has 100 or more points. Whoever has the lowest number wins. Special rule: Whenever one column of 3 cards all have the same value, they will be discarded and no longer scored. Cards are ranked from -2 up to 12