When the board is stopped, you'll get whatever you stop on. The board would spin, and you can stop it by slamming a plunger. The value of each square changes every second or so. Each square has 3 different cash values, prizes, or a Whammy. This huge board, which was what the show was famous for, has 18 different positions. Each 'spin' gave you a chance to play at the big 'Press Your Luck gameboard'.
A wrong answer gives you no spins, but you won't get penalized. If you answer the question correctly, you get up to 3 spins. The questions usually test common knowledge, or is a survey question. A game is divided into 4 rounds, the first and third being standard trivia sessions. Press Your Luck is best described as Wheel of Fortune meets Jeopardy!: a show that pits one champion against two challengers and requires both luck and knowledge to win. A decent computer version of an oldie TV game show of the same name.