Can someone explain to me how I lost this round?

Opponent has 4 dice: 6 5 2 2 I have 4 dice: 1 5 3 1

Opponent said they had 3 6's I challenged I lost the challenge

I see only 1 six and no 1's in my opponent's dice, so how did I lose?

This game confused me.

Bluff counts all the dice in play, not just the ones belonging to the guesser. So from his six and your two wild ones, there's three in all.

Thank you. Makes sense why I was losing all the time. I guess I misunderstood the rules.