How to Play
Playing a Liar Card:
Whenever you play a Liar Card, you must play it face down and state out loud what the card is.
If the card matches the discard pile, you are telling the truth.
If the card doesn’t match, you must bluff.
Your lie must be plausible based on the top card (e.g., claiming your face-down card is the correct color, the correct number, or a Wild).
The Challenge:
After you play a face-down card, any player can challenge you before the next turn begins.
If you were lying: You must take the card back into your hand and draw 1 penalty card.
If you were telling the truth: The challenger must draw 1 penalty card.
No Challenge: If nobody challenges your face-down play, you get away with it.
The card remains face down, and its declared effect happens (if it’s an action card).
Illegal Moves: You are not allowed to play a Regular Card face down.
If you do, and you get caught, you take the card back and draw a massive penalty (usually 6 cards)

New Action CardsUNO Liars introduces hilarious new card mechanics that shake up everyone’s hands:
7s Swap: Playing a 7 means you choose any player and swap your entire hand with theirs.
0s Pass: Playing a 0 forces all players to pass their hands to the next player in the direction of play.
Wild Liar’s Challenge: A powerful card played face up.
You name a color, and all other players place a card face down in front of them.
You can then challenge players one by one until you find someone who lied, or until everyone tells the truth.