A single exploding kittens deck (regular or nsfw) supports up to 5 players. Using multiple decks (2x NSFW) allows playing up to 9 players (some people combine NSFW + Regular for this, but then the odds of getting pairs is reduced)

The imploding kittens expansion increases the max player count by +1.

Streaking kittens expansion does not increase the player count, as it allows 1 player to hold an exploding kitten in their hand.

Currently this mod produces an index exception with 6 players, even if imploding kittens is added.

Some script to assist secretly inserting the exploding and imploding kitten cards back into the deck would be very useful. Current manual methods of cutting the deck are clunky and too observable.