As the name suggests, Pass-Ackwords turns the long-lived game of Password on its head, with players now giving clues that they hope their "partner" will not decipher in the right way.
As in Password, four players compete in teams of two; unlike in Password, you and a member of the opposing team take turns giving clues to the remaining player on the opposing team. How this works is that the clue givers have a device that shows a list of clues. Each turn, one clue giver chooses one of the listed clues, presents it to the opposing guesser, and hopes that he presented it with the wrong intonation so that the guesser won't guess the secret code word. As the crummy clues are used up, the clues will get better and better, so your challenge as the clue giver is to quickly figure out what might give a hint to your partner without giving the thing away entirely – which again is pretty much like Password!