Originally Posted by mickeycrimm View Post
What some are calling "gaffed" is nothing more than weighted randomness which is quite legal under gaming regulations.
Distinction without a difference? If the weighting is sufficiently extreme, it becomes functionally equivalent to gaffing.

Originally Posted by The Boz View Post
Could it be similar to the Must Hits like River Dragon that are weighted to almost always run to the end, but theoretically can be hit on any spin?
Good example.

The regs include a few general safeguards such as the 75% minimum payout. Here's one from technical standard 2:

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Generally though, designers are allowed to be very, very tricky. I'm looking at it from the perspective of accurate analysis. Some of these new games are very difficult. For a highly competent slot AP, this may be a good thing because it discourages competition.