The order of the symbols on the reel can make a big difference. Section 2: Reel Strips and Symbol Distribution “losers,” and then calculates the overall RTP (also known as payback percentage) from that. Generally it lists all the possible combinations of reel positions on a slot, determines how many of those represent “winners” vs. A Simple PAR Sheet ExampleĪ PAR sheet presents the theoretical probabilities and payouts for a slot machine game. Par sheets for physical slot machines might include additional data about physical limitations or features of the mechanical reels. Other special features, such as multipliers or expanding wilds.Scatter symbol probabilities and payouts.A summary of key performance factors like Return to Player (RTP), Hit Frequency, and Volatility.There is no standard format for a PAR sheet, though they usually include the same things, depending on the game features: I’ll try to demystify PAR sheets in this and future posts, and show how valuable they are for designing slot machine games. Some have leaked out, but often it has required researchers to petition the manufacturers using Freedom of Information Act laws. It isn’t easy to find examples of actual PAR sheets for classic slot machine games online. Historically, slot machine manufacturers have zealously guarded their PAR sheets as trade secrets.
The classic Fey Liberty Bell (circa 1899).
