Card Sharks was an American television game show created by Mark Goodson-Bill Todman Productions. Although various changes were made to the game's format throughout its run, the core format of Card Sharks remained the same. Two contestants competed against each other, providing their guesses to the answer of various questions (most commonly survey questions) to gain control of a row of cards, and then determine whether the next card in the line was higher or lower in value. (The concept of determining the cards' value is similar to the card game acey-deucey.)

Jim Perry hosted the show's first incarnation, which was aired on the television network NBC from 1978 to 1981. A 1986 revival was aired by CBS and hosted by Bob Eubanks; this version overlapped with a syndicated version hosted by Bill Rafferty. The third and most recent version of Card Sharks aired in syndication as well; hosted by Pat Bullard, it lasted from 2001 to 2002.

Revamped version of the classic game show, which mixed in elements of "Candid Camera" and "People are Funny" with the familiar high-low card game based on the rules of Acey-Deucy. Four contestants, two at a time, competed in two separate best-of-three High-Low challenges. In the High-Low challenge, the contestant chosen to go first was shown the base card (in a block of seven) and had to guess whether the next card was higher or lower than the one just shown. An incorrect guess passed control of the block to his/her opponent. At any time, the contestant in control of the cards could use a "Clip Chip" to change the card currently in play. However, to change the card, he/she had to correctly guess the outcome of a "Video Dilemma;" these hidden-camera vignettes depicted moral situations (e.g., a pretty woman asking a passerby whether she should leave a note on the windshield of a car she just dented), behavioral questions (e.g., whether a college football quarterback would choose a sexy female college student wearing a white T-shirt and blue jeans or the girl's twin sister wearing a sexy evening gown) or a man-on-the-street interview (e.g., guessing which of two cars a man owns, either a sports car or a sports-utility vehicle). Each High-Low playoff was worth $500, with the winner of two facing the next best-of-three "High-Low" challenge winner one-game High-Low challenge. The winner of that playoff won an additional $1,100, was the day's champion and played the Money Cards. The rules were largely identical to those from the classic show, with the following changes: Only six cars were played, the contestant's current $2,100 cash winnings were turned into betting money and divided evenly on the three-tiered board (i.e., $700 for each row), and the contestant always played the Big Bet (even if they "Busted" on the second row, if they had nothing when they reached this point, they were given $700). As before, minimum bets were $50 except for the Big Bet card, where they had to risk at least half; the contestant was allowed to change the first card on each line (without having to answer a Video Dilemma); the maximum take was $51,800. Written by Brian Rathjen

In 1978 NBC debuted "Card Sharks" and it features two(2) contestants, one(1) a champion competed. The host read a question asked of 100 people in a certain group (e.g., mothers-to-be, homecoming queens & Congressmen). The questions could be serious, funny, cute ... but were always interesting. The 1st contestant had to predict how many of those 100 people answered a certain way, while his or her opponent had to guess whether the actual figure was higher or lower. The contestant who was correct played a card game based on Acey-Deucey; he or she was shown their base card (they could play it or change it) and had to guess whether the next card was higher or lower than the previous one(1) card. {The Playing Cards ranked from Ace(High) to 2(Low)}. Any incorrect judgment (miscall or mistake) allowed the opponent a chance at his/her row of cards (no change of the base card allowed); players could "freeze" at any point to keep their opponent away from their cards or to gain an advantageous position. Up to four questions were played per round, with the 4th and final question called "sudden death." One game to complete all 5 cards calling Higher or Lower wins $100 and be the first(1st) player to win two(2) rounds collects $200 played the Big Money Cards; if a third (3rd) round was required, a "Sudden Death" round with 3 cards and a maximum of 3 questions was played. In the Big Money Cards, the champion used an initial purse of $200 to bet on a series of seven cards (positioned on a three(3) row board, with an extra $200 ($400 in 1986-1989) given after play of the third card); the first card on each row could be changed; correct guesses earned the player their bet, while wrong guesses lost the bet. The final card, if they didn't "BUST" before this point was the "Big Bet," where the contestant had to bet at least half(1/2) of his/her cash. Up to $28,800 was possible. Champions continued until defeated or until winning seven(7) games. The Game Play was largely similar in the 1986 CBS/syndicated revival with the following changes: 1. Questions could also involve "educated guesses" or general knowledge questions with numerical answers and a special 10-member polling group seated in the audience who played for the entire week. 2. In September 1986, After the Big Money Cards (for a chance up to $32,000), players could use any jokers found in the deck to help them win a new car with the help of 7 numbered cards (1 "CAR" & 6 "No" Cards); In June 1988, this was changed to a question read about the 10-member polling group, with a player winning the car for guessing the number exactly by moving a blue diamond shaped marker to place the number from 0 to 10. The Show changed from 7 wins to 5 wins on CBS-TV & Syndicated. Written by Ben Hallums