Five pods on your side of the cistern, five on theirs, and the dark between.
It is a game the two of them play. Moor your pods where the other cannot see, then take turns lobbing a stone across. A bean struck means a pod found; find every bean of all five before yours are found.
One of you starts a game and reads its code to the other. Whoever starts is the royal they picked; the one who joins is the other.
Read this to the other player.
The game begins the moment they type it in.
The stones wait on the bank.