Two going head-to-head is an undiluted contest ... It's a fine game but, better still, you can also use the cards to play a related 2-player game, Lost Cities (see it on Amazon).

Once the stock is empty, Phase 2 begins. The winner of the 13th trick ... I couldn't find much evidence online for the two-player game bunty, which I first came across in a booklet in the Observer.

It Takes Two is a unique co-op game where players guide an estranged couple through creative puzzles to mend their relationship. Several similar games offer a more adult-themed co-op experience.