✨ Gaming Machine Technical Requirements
904 NEW ZEALAND GAZETTE No. 32
Minimum Period for Prize Determination using One RNG Value
3.14.11 Following a low probability game outcome (e.g. a jackpot win, major prize win, or a particular graphic game result presentation), where that game outcome is represented by only one RNG value or a small number of RNG values, it is important that subsequent game play on that machine is unpredictable. The intent here is to ensure that the machine does not subsequently go through one defined sequence of game outcomes, or one of only a few possible sequences of game outcomes, and that game outcomes are consistent with the mathematical model of the game. Thus in such implementations, the 'Period' of the RNG must be a factor greater than its 'Range'.
Minimum Range Requirement
3.14.12 The range of values produced by the RNG must be adequate to provide sufficient precision and flexibility when setting event outcome probabilities, (i.e. so as to accurately achieve a desired expected return to player).
Mapping
3.14.13 Mapping of random numbers into symbols (or reel stop positions) should observe the following principles:
a) the output resulting from the mapping of an RNG to symbols (or reel stop positions) must not be predictable;
b) any outcome derived from the random number generator are uniformly distributed;
c) any mappings to convert random numbers into game symbols are linear, and the distribution of the mapped symbols is identical to the distribution of the unmapped random number from which they were derived;
d) the mapped random number sequence must demonstrate that they are statistically random when subject to the same statistical tests for randomness specified for the base random number generator; and
e) the game outcomes which are derived from either a combination of mapped symbols or directly from the unmapped random numbers must have the same distribution and probability of occurrence as the game that the machine implements. In particular, poker games must have the same first hand distribution and probability as hands dealt from a randomly shuffled deck of cards; spinning reel games must have the same outcome probabilities and outcome distribution as the physical model upon which the game is based, and so on.
Scaling Algorithms
3.14.14 If a random number with a range shorter than that provided by the RNG is required for some purpose within the gaming machine, the method of re-scaling, (i.e. converting the number to the lower range), is to be designed such that all numbers within the lower range are equally probable.
3.14.15 If a particular random number selected is outside the range of equal distribution of re-scaling values, it is permissible to discard that random number and select the next in sequence for the purpose of re-scaling.
3.15 Progressive Jackpots
Communication with Jackpot Controller
3.15.1 There must be a secure, two-way communication protocol between the main game processor board and the jackpot controller (if used). This protocol must incorporate CRCs at a minimum for data integrity and security.
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Online Sources for this page:
VUW Te Waharoa —
NZ Gazette 2002, No 32
Gazette.govt.nz —
NZ Gazette 2002, No 32
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Gaming Machine Display and Functional Requirements
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