In Triggs, the numbers 1-12 appear on your player sheet 2-5 times, and you want to cross them all off first in order to win.
On a turn, you either draw cards, discard cards, or tick off numbered boxes. When you draw, you take two cards from the face-down deck or the two face-up decks as you choose. You have a maximum hand size of ten cards, and when you discard, you can dump only cards of the same number.
To tick off numbered boxes, you name a value from 1-12, then play cards from your hand, whether a single card matching that value or a pair of cards that sum to that value. Tick off one space in that row for each card or pair of cards you play. When you cross off the final box in a row, you gain an extra cross, which (if you play cleverly) might earn you another cross, and so on.
After discarding or playing cards, if you have no cards in hand, draw five cards from the face-down pile.
The first player to cross off all of the squares on their player sheet wins.