Theoretical hold worksheet is a document provided by a manufacturer, as required by law, for all slot machines sold. It is the main method by which machines are legitimized by governments and is used to display the payout schedule of a machine. It indicates the theoretical percentage that a slot machine should hold based on adequate levels of amount paid in. This is the reason why it is termed as a worksheet. A worksheet also contains information regarding the reel strip settings, number of coins that may be played, the payout schedule and the number of reels. Other information descriptive of a slot machine may also be given in a theoretical hold worksheet.