Pairagon

Pairagon is a 2-player memory game that can be played using a standard deck of playing cards. The objective is to be the first to reveal all five pairs that are face down in the middle in a single turn. You use the cards Ace to five, Ace having the value of 1. Each turn a player reveals two cards, continues if they matched until either all cards are revealed or non-matching cards are turned up. The twist comes that if a non-matching pair was revealed, you add their numbers, turn all cards face down and count to the card in the position of the added number from your the left. You then shift that card to the left of the middle row. Now try again. There are also some variants to make the game easier or harder.