Mods that add more players
Community mods that push the player count past the stock 2–4 cap — what works, what doesn't, and what to expect on patch day.

3 min
Stable
Edge case
Wait 3 days
6-player mods
The most stable "more players" mods support 6. The UI starts to feel cramped at this count, and certain minigames scale poorly. Most of the 6-player mods target Steam Workshop and have held up across the last two patches.
8-player mods
8-player is at the edge of what the engine handles. Expect occasional frame drops on mid-range hardware and some minigames to break entirely. Fun for parties; not for serious runs.
Patch day
More-players mods tend to break on patch day. Don't queue them in a serious run the same week a major update lands — give the mod authors a few days to push fixes.
Alternatives
If you want chaos without the risk, host a 4-player game with the chaos-rule mods — they keep the stock player count but break the rules in entertaining ways.