Games

... I'm sorry, what?

Do ... does any Mario Party game even have microtransactions? You know, specific game content unlocked by an additional purchase with real world currency? Much less ones where the outcome of a purchase is substantially randomized?

EDIT:

Games that feature "simulated gambling," such as casino games, will be legally restricted to adults aged 18 and over with a minimum classification of 'R 18+.' Projects that were classified before September 22 won't need to be reclassified unless they lose their current rating due to "revocation or modification."

This sounds like it isn't a retroactive change, its a going forward change. It's explained further in the actual guidelines:

Situations where video games may require reclassification Video games that were classified prior to 22 September 2024, but add in-game purchases linked to elements of chance or simulated gambling content may require reclassification if adding this content is likely to affect the classification of the game. For example: – video games classified G or PG that add in-game purchases linked to elements of chance after 22 September 2024 are likely to require reclassification – video games classified G, PG, M or MA 15+ that add simulated gambling content after 22 September 2024 are likely to require reclassification

So... yeah, Mario Party games would have to be patched or re released or something to add more gambling content.

It does seem to indicate that, going forward, a Mario Party game that simulates casino like gambling would get an R 18+ rating, but the Mario Party franchise does not seem to me to have had any minigames that even sort of resemble a casino type game, even with neutered or non existent betting/staking mechanics, in about a decade.

The upcoming Super Mario Jamboree, though public info on the minigames is incomplete, also does not appear to depict any casino like games.