How many players do I actually need for an adult party card game?

Most titles in this category hit their sweet spot at 4–8 players. Cards Against Humanity and its expansions scale well up to roughly 10, while Exploding Kittens caps at 5 in the base box (the Party Pack pushes it higher). For very large groups, prompt-driven games like Incohearent and Who's Most Likely To… tend to be the most forgiving.