One Up, One Down

How to play

1. Two piles, no turns

   Two cards sit face up in the middle. Nobody waits for anybody — you and your rival play at the same time.

2. One above or one below

   A card fits a pile when its number is exactly one away. Colours mean nothing, and 9 never meets 0.

3. Empty your hand

   You hold five cards and draw a new one every time you play. If you both get stuck, the table opens two fresh cards. First to run out wins.