No, not the eating utensil. Chopsticks is a simple yet entertaining game I learned in elementary school to pass time while waiting in line. It’s convenient, as it doesn’t require much equipment — just two hands (at least four fingers each) and basic arithmetic.
I’ve usually played this as a two-player game, but you can really have as many people as you like, so long as you can fit them all facing each other (directly across for two, circle-ish for anything more) in whatever space you’re playing in.
Each player starts with both hands out in front of them, one finger on each raised. From there, whoever is going first will choose someone (anyone) and tap one of their hands with one of their own. The tapped hand raises a second finger, and play continues either clockwise or counter-clockwise (because it honestly doesn’t matter so long as it’s agreed upon).
It’s not always one that’s added to the hand. The principle of the game is that however many fingers are raised on the hand that taps, that’s the number added to the hand that’s tapped. Once a hand gets to five, that hand is fisted, put behind your back, or otherwise indicated as “dead.” If both your hands are dead, you’re out of the game.
Instead of tapping someone else’s hand, you can choose to tap your own together. This is an action of rearranging chopsticks; for instance, if you have four fingers raised on one hand and one on the other, you might adjust it to three and two. You’ll end up with the same amount of fingers raised, just redistributed, usually to lower the chance of a high-numbered one getting out. The rules vary by group (make sure you confirm them ahead of time!) so in some versions it’s acceptable to redistribute chopsticks to a dead hand, bringing it back into play, and in others once the hand is out, it stays out. It is not, however, a legal move to flip the values of your hands. (Think 2 and 3 to 3 and 2; nothing has actually changed, which prevents the game from properly progressing.)
The winner is, of course, the last person with at least one hand left in the game.