Whenever I play a game with someone new, we quickly realize we have to clarify the rules we’re using beforehand, since so many people have their own varieties. What are some non-standard game rules that you/your family/friends follow?
I’ll start. My family has a rule where we’re not allowed to win on a Wild card. It adds a bit of challenge, and keeps someone from being unbeatable if they play by hoarding wild cards.


Players must agree beforehand whether you can counter +4s with +2s, and if they’re restricted to the color that the +4 user picked or not.
If you can’t play a card, you buy only one card and if you can’t play it, you skip that turn.
If you have multiple cards of the same number (even if different colors) you can play them all at once (but it must be at once, if you didn’t realize you had a stack of similar cards that’s your loss)
You cannot stack sequential number cards (that means no playing 1, 2, 3, 4, 5… at once even if they’re the same colors)