There are no winners here, only one loser who collects too many pests. You pass a card face down to a player and claim it is a cockroach, a stink bug, or a rat. They can either accept the claim, guess if you are lying, or peek at it and pass it along.
The cards are plain but the expressions on the cartoon insects are funny. It is a pure psychological battle where you can gang up on a single struggling player.