Predict. Trade. Win.

Color Clash. Each round has two steps. Step 1: you secretly lock in a colour; your opponent does the same. Step 2: each of you guesses the colour the other locked in. If your guess matches their colour you score 1 point. After both guesses the colours are revealed. First to 3 points wins; if nobody gets there after 5 rounds the higher score wins, and equal scores are a draw.

Card Duel. You and your opponent each hold the same ten hearts, 1 to 10. A coin toss decides who sets first. The setter secretly lays one heart face down. The other player is the guesser and has up to 3 tries to name it; after each wrong try the game says whether the hidden card is HIGHER or LOWER. Naming it wins the round for the guesser; using up all 3 tries wins it for the setter. Whoever lost the round sets the next card. The first player to 3 round wins takes the pot (there are no draws, so a match lasts 3 to 5 rounds). Every play has a 45-second clock: if it runs out, a random legal card is played for you. Your opponent never sees your hidden card until the round is over. A tip: as guesser, picking the middle of the range each time finds most cards in 3 tries.