Head canon: Ferengi have an equivalent to sudoku where it's like accounting ledgers but they have to fill in the solution with the highest possible profit. Quark finds Odo trying it one day and almost faints when he sees it filled out with full honesty and the only error favoring the other party.

next: odo somehow opens a free youth center and public swimming pool in a game of monopoly; quark uninvites himself from board game night indefinitely