Try to remove all cards by combining 2 cards to a total value of 13. A king is 13 points and can be removed on its own, a queen is 12 points, a jack is 11 points and an ace is 1 point.
Fun Tripeaks type of solitaire card game. Click/tap on cards on the tableau that are 1 higher or 1 lower then the open card(s) top right. Click on the stack (top left) to get a new open card. Unlock extra foundation spots with the key cards.