✨ Gaming Machine Standards
1488
NEW ZEALAND GAZETTE
No. 56
c) be attainable combinations of the mapped symbol set (except random prizes).
Game Minimum RTP
3.9.15 A game must have a theoretical/estimated statistical expectation that the minimum player return (RTP) of the game will be greater than or equal to [MINRTP].
Game Maximum RTP
3.9.16 A game must have a theoretical/estimated statistical expectation that the maximum player return (RTP) of the game will be less than or equal to [MAXRTP].
Standard Deviation
3.9.17 The Nominal Standard Deviation (NSD) of a game must be no greater than 15.
3.9.18 While the standard deviation of individual components of a game (e.g. feature games, metamorphic sequences etc.) may exceed 15, the NSD of the whole game must not exceed 15.
3.9.19 In determining the NSD for a game, the following conventions must be applied :
a) Calculate standard deviation of the base game at minimum bet and single line play or equivalent. (Should the underlying game algorithm or randomising mechanism change with a change to play options selected (e.g. different virtual reels are activated upon a change to the number of lines played or certain prize categories are only available by selecting specific play options), the highest standard deviation result must be used);
b) Coinciding prizes are to be treated as separate prizes (e.g. a payline prize of 20 coinciding with a scatter prize of 50 are to be treated as two separate prizes of 20 and 50);
c) Feature game prize contribution must, as a minimum, be calculated using a set of individual feature prizes with corresponding weighted probabilities for each prize. (The calculation method must not use the mean of all feature prizes treated as a single base game prize);
d) For the purposes of c) above, feature game prizes are to be calculated under conditions applicable to the feature when the base game is in the mode referred to in a) above (i.e. using the same bet and line pattern or equivalent);
e) Gamble features (e.g. Double-up) are to be excluded;
f) Progressive prize components, both standalone and linked, are to be excluded;
g) All calculations must be made to a minimum accuracy of four decimal places and the NSD must be reported to a minimum accuracy of two decimal places.
Non-linear Paytables
3.9.20 The [MINRTP] must be met when playing at the lowest end of a non linear paytable (e.g. if a game is continuously played at a minimum bet level for its total game cycle and the theoretical RTP is lower than [MINRTP], then the game is unacceptable). This example also extends to games such as Keno where the continuous playing of any spot combination results in a theoretical RTP lower than [MINRTP].
Carded Percentage
3.9.21 A manufacturer may for venue information purposes provide a “carded percentage” which, for games of skill or games with non-linear paytables, represents the player return expected in operation when historical knowledge of player preference or skill is applied. This percentage may appear on the gaming machine program provided it is clearly marked as “carded percentage” or another term not likely to be confused with [MINRTP].
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Online Sources for this page:
VUW Te Waharoa —
NZ Gazette 2003, No 56
Gazette.govt.nz —
NZ Gazette 2003, No 56
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Software Standard for Gaming Machines
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🏛️ Governance & Central AdministrationGaming Machine, Power Save Mode, Reels, Game Play, Fairness, Credit Meter, Free Games, Bonus Features, Player Choice, Wagering, Idle Mode, Game Information, Automatic Play, Skill Games, Prize Determination