OH cards consists of two decks of cards: 88 picture cards and 88 word cards. There are several games that can be played with the cards. Games typically involve the player placing a picture card upon a word card and drawing associations between the two. From the instruction book: "The OH cards lend themselves to many uses, from lighthearted storytelling to insightful self-exploration. Each of the games included in the instruction book can accommodate technical variations that you may wish to devise to suit your own circumstances."