Sources of the game "Find a Pair" PascalABC.Net

The playing field consists of an even number of cards face down. Each card on the field has a pair. The user flips the card then the next one, if the cards match, then they are considered guessed and remain open. If not, then both cards are turned upside down after some time allotted to the user to remember the cards. The game continues until all cards are guessed.