Board Game Arena

I've noticed several times that when a player has multiple copies of a card, they get to turn them all over on their turn. When I tried it, it didn't allow meto turn over more than one card.

For instance, I just played a game where my opponent had 4 of the #1 cards. When he rolled a 1, he turned all the cards over, one after the other!

Is there a rule I'm missing?

It doesn't allow you to flip multiple cards if you're using the 1's or 5's special ability. I'd bet this is what happened. Post a link to the specific game you're referencing if you want confirmation.

This is the game I referred to: Spooky Tower #868524418

The move with multiple flips was the last turn, starting at move 57.

The odd thing isn't that your opponents flip multiple cards, the odd thing is that you're saying it doesn't work for you. Because yes, when you have multiple cards in the same stack you will flip them all over with a single roll when you select that stack. But this doesn't work if you're flipping with a 1 or 5's special ability. Hope this helps!