Play Liar's Dice Online

What Is Liar’s Dice?

Liar’s Dice is a bluffing game played with hidden dice. Each player rolls five dice under a cup, peeks at their own, and then everyone bids in turn on how many dice of a particular face are showing across the whole table, hidden dice included. “Four 5s” means “I claim there are at least four 5s among all the dice on the table.” Every bid must be higher than the one before it, so the claims escalate until somebody decides the last bid is impossible and calls “Liar!”. The cups come up, the dice are counted, and whoever was wrong loses a die. When you are out of dice, you are out of the game.

What makes the game special is that you are never guessing blind. You know your own five dice, you know how many dice are hidden, and you know that each hidden die shows any given face one time in six. Add the standard rule that 1s are wild, and a hidden die matches your bid one time in three. Liar’s Dice is therefore a game of probability first and psychology second: the best players count before they bluff. If you enjoy the counting part, Dice Poker uses the same five dice with no bluffing at all; if you enjoy the nerve, Craps offers a different kind of tension against the house.

A Short History of Liar’s Dice

The game is known in Spanish as Dudo, “I doubt”, and it is played across Peru, Chile, Bolivia and Argentina with the same bidding structure used today. A popular legend says the Inca ruler Atahualpa taught the game to Francisco Pizarro while he was held captive by the conquistadors in 1532, and that the Spanish carried it home to Europe. It is a good story, and the makers of Perudo repeat it, but there is no documentary evidence for it. Sceptics point out that there is no record of six-sided dice in the pre-Columbian Andes, and the dice themselves were most likely brought to South America by the Spanish rather than the other way round. What is certain is that the bidding game was well established in South America long before it reached English-speaking tables.

The modern boxed game began in 1982, when the Peruvian businessman Alfredo Fernandini and his British friend Cosmo Fry were invited to join a game of dudo at the Lima Golf Club during a rain delay. They adapted the rules, had leather cups made by Peruvian artisans, and launched Perudo (Peru plus dudo) in London in 1989 through Inca, a South American craft shop in Belgravia. It sold 210 sets on its first day, reached Harrods, Hamleys and WH Smith by 1992, and was licensed to University Games and Hasbro in 1995. Independently, Milton Bradley published a boxed Liar’s Dice in the United States in 1987, and designer Richard Borg’s version, Bluff, published by F.X. Schmid, won the German Spiel des Jahres in 1993.

The game’s biggest moment in popular culture came in 2006 with Pirates of the Caribbean: Dead Man’s Chest. Aboard the Flying Dutchman, Will Turner learns the game from the crew and challenges Davy Jones, wagering years of service to discover where Jones hides the key to the chest. Will’s father, Bootstrap Bill, joins the game and deliberately makes an impossible bid so that he, not Will, loses. The scene sent a generation of players looking for the rules, and the version on this page is the one they found: five dice each, wild 1s, and the loser of each round opening the next.

Liar’s Dice Rules

Equipment

• Five six-sided dice per player (ten dice in the two-player game on this page)
• One opaque cup per player to roll under and hide your dice
• Enough players to make it interesting: two to six is typical

Object of the Game

Be the last player with dice. You lose a die every time you make a bid that turns out to be false when challenged, and every time you challenge a bid that turns out to be true.

How a Turn Works

1. Roll. Everyone shakes their cup and rolls, keeping the dice hidden under the cup. Look only at your own.
2. Open the bidding. The starting player names a quantity and a face, for example “three 4s”. This is a claim about all dice on the table combined.
3. Raise or call. The next player must either raise the bid or call “Liar!”. A raise is any bid that is higher: a greater quantity of any face, or the same quantity of a higher face. “Three 4s” can become “three 5s”, “three 6s”, “four 2s”, “seven 3s” and so on. The quantity can never exceed the number of dice on the table.
4. The reveal. When someone calls, all cups are lifted and the dice of the bid face are counted, with 1s counting as wild. If the count meets or exceeds the bid, the challenger loses a die. If it falls short, the bidder loses a die.
5. Next round. Everyone rolls again. The player who just lost a die opens the bidding.

Wild 1s and Bidding on 1s

A 1 is wild and counts as the face being bid. A bid of “five 4s” is satisfied by three 4s and two 1s. The only time 1s are not wild is when the bid is on 1s themselves: “three 1s” means three actual 1s.

Because real 1s are half as common as “4s or 1s”, the version we play, following Perudo, treats a bid on 1s as worth double:

• To switch to 1s from any other face, you need at least half the current quantity, rounded up. After “five 3s”, the next bid can be “three 1s”.
• To raise a bid on 1s with 1s, simply bid more of them.
• To leave 1s for another face, you need at least twice the quantity plus one. After “three 1s”, the next bid on another face must be at least “seven” of it.
• Opening bids may not be on 1s. The first bid of every round names a face from 2 to 6.

Some groups instead ignore all of this and treat 1s as an ordinary low face, or as wild with no special bidding rule. Those are legitimate house rules; the game above uses the double-value rule, and the hint text below the dice restates it while you play.

Scoring Summary

Worked Examples

Every example uses the two-player game on this page: you hold five dice, the computer holds five, ten dice in all.

• You hold 4 – 4 – 1 – 2 – 6, no bid yet. You have three “4s” (two real, one wild). Five hidden dice add about 1.7 more on average, so “four 4s” is a solid opening (about 87% likely to be true), and “five 4s” is a fair one (54%). Opening with “three 4s” gives nothing away but also applies no pressure.
• Computer bids “four 6s”; you hold 6 – 1 – 3 – 3 – 5. You have two matches. The bid needs two more from five hidden dice, which happens 54% of the time. Calling is a coin flip. Raising to “four 3s” is illegal (lower face); “five 3s” needs two hidden matches for your own three 3s and is exactly as risky as the computer’s bid.
• Computer bids “six 2s”; you hold 5 – 5 – 3 – 4 – 6. You have zero 2s and zero 1s, so all six must come from five hidden dice. That is impossible. Call “Liar!” and take a die.
• You bid “five 5s”, the computer calls; the table shows 5 – 5 – 1 – 2 – 3 and 5 – 1 – 4 – 6 – 6. Count 5s and 1s: three 5s and two 1s make five. The bid is met exactly, so the challenger, the computer, loses a die.
• Computer bids “two 1s”; you hold 1 – 1 – 4 – 4 – 2. You already hold two 1s, so the bid is certainly true. Do not call. You can raise to “three 1s” (you need one real 1 from five hidden dice: 60%) or jump to another face at “five” or more, where your two 1s act as wilds.

The Odds: Counting Before You Bluff

Liar’s Dice is a binomial problem. Each hidden die matches a bid on 2–6 with probability 1/3 (the face itself or a wild 1) and a bid on 1s with probability 1/6. The expected number of matches among n hidden dice is therefore n/3 for an ordinary face and n/6 for 1s. In the two-player game, five hidden dice contribute about 1.67 extra matches to any ordinary bid.

The table shows how often the five hidden dice supply at least k matches. To use it, subtract your own matching dice (including 1s) from the bid to get k.

Some conclusions follow directly:

• A bid that needs two hidden matches is roughly even money. A bid that needs three is a bluff three times out of four unless the bidder is holding them.
• Across all ten dice, before anyone looks, the expected count of any ordinary face is 3.3. Bids of four or five are the normal battleground; from a neutral standpoint a bid of six of one face is true less than 8% of the time and a bid of seven only 2%, so somebody at the table must be holding a lot of them.
• Bids on 1s are much harder to fill. Two hidden 1s from five dice happen only one time in five, which is exactly why the double-value rule exists.
• Fewer dice make bids easier to read. In a 3-versus-2 endgame the hidden information is tiny, and the player with more dice has a structural edge simply because more of the table’s dice are known to them.

The game above prints these probabilities live. Below the computer’s bid it shows how likely that bid is given your dice, and below your bid builder it shows the same for the bid you are about to make.

Liar’s Dice Strategy

1. Count first, then decide

Before every decision, add your matching dice (face plus 1s) and compare the shortfall with the table above. Most beginners lose dice by calling bids that were 87% likely and by making bids that were 21% likely. The arithmetic takes five seconds and removes most of the guesswork.

2. Bid what you hold

Your strongest opening is the face you hold most of, counting 1s. If you hold two 4s and a 1, “four 4s” is comfortable and “five 4s” is defensible. Opening on a face you do not hold makes every later raise a bluff.

3. Read the raise pattern

When an opponent keeps returning to the same face, they probably hold it. When they jump faces every turn at the same quantity, they are stalling and the quantity is probably near its ceiling. A player who suddenly leaps two quantities is either very strong or very weak; against the computer on this page, a big jump usually means it is holding the face.

4. Use the “safe raise” while you can

If the current bid is comfortably true from your seat, raising the face at the same quantity (“four 3s” to “four 5s”) passes the decision back cheaply. Save the challenge for a bid that needs three or more hidden matches.

5. Make the opponent’s next bid hard

A raise to the quantity ceiling for the current dice count, or a switch to 1s at half quantity, leaves the next player with few legal raises and forces them to call. Under the double-value rule, “three 1s” can only be followed by “four 1s” or a jump to seven of another face: that is a strong bid if you hold two real 1s.

6. Bluff on faces you partly hold

A bluff of “five 5s” holding two 5s is one roll of the dice away from being true. A bluff holding zero 5s and zero 1s is a lie you must keep lying about. Bluff early in the sequence, when quantities are low and the reveal is still far off.

7. Adjust to dice counts

With ten dice on the table, expect bids to reach four or five before a call. With six dice, three is already ambitious. Recalculate your thresholds every round; the computer opponent does exactly this, becoming more willing to call as dice disappear.

8. When in doubt, call the bid that needs the most

If two bids in a row both look shaky, challenge the one that needs the larger number of hidden matches, not the latest one. In the two-player game this simply means: do not raise a bid you believe is false; calling it is the only way to punish it.

Common Mistakes

• Forgetting that 1s are wild when counting your own dice, and calling a bid you were actually holding up yourself.
• Calling a bid that needs one hidden match. With five hidden dice that bid is true 87% of the time.
• Bidding 1s as if they were an ordinary face. Under the double-value rule “three 1s” is a serious claim, roughly as strong as “six 4s”.
• Raising a bid you think is a lie. Raising validates the bid and lets the liar off the hook; if it is false, call it.
• Opening at the maximum you can justify. Leave yourself room: an opening of “four 4s” can become “five 4s” later; an opening of “six 4s” leaves you nowhere to go.

Variants and House Rules

• Perudo / Dudo (South America, UK). The rules above, plus Palifico: a player reduced to one die opens a special round in which 1s are not wild and bids may only raise the quantity. Perudo also allows a “calza” (exact) call, where a player claims the bid is exactly right and wins back a die if so.
• Milton Bradley Liar’s Dice (1987). The boxed American version with cups for each player. Its rulebook differs from Perudo in details, so check how it treats 1s before mixing the two rule sets at one table.
• No wilds. Some families play with 1s as an ordinary face. The expected count per hidden die drops from 1/3 to 1/6, so bids stay much lower.
• Elimination vs. points. Instead of losing dice, some groups score a point per lost challenge and play to a total, which keeps everyone in the game. Dice Poker and Ship Captain Crew both suit that head-to-head, score-keeping mood.

If you like games where reading an opponent matters, the card-free bluffing here pairs well with Craps for pure odds and Bunco for a lighter dice night.

Glossary

• Bid: A claim that at least a certain number of dice show a certain face across the whole table.
• Call / Dudo / Liar: A challenge to the previous bid, forcing the reveal.
• Wild: A 1, which counts as the bid face unless the bid is on 1s.
• Aces: Another name for 1s, borrowed from Perudo.
• Palifico: Perudo’s special round for a player down to one die.
• Calza / Spot-on: A claim that the bid is exactly correct.
• Quantity ceiling: The total number of dice in play, the highest legal quantity.
• Opening bid: The first bid of a round, made by the player who lost the previous round.

Play Liar’s Dice Online on Dice.now

The game at the top of this page is a two-player Liar’s Dice match against the computer. You each start with five dice; yours are shown face up and the computer’s stay hidden behind black question-mark dice until someone calls “Liar!”. You open the first round; after that the loser of each round opens. Build a bid with the quantity and face chips, and only legal raises are enabled, so the double-value rule for 1s (switch at half, leave at double plus one, no opening on 1s) is enforced automatically. A hint under the current bid tells you how likely it is to be true given your dice, computed from the binomial distribution over the hidden dice, and a second hint does the same for the bid you are building. The computer counts its own dice, estimates the rest at one in three (one in six for 1s), raises when a bid is plausible, calls when it is not, and bluffs about one time in seven. The bid history panel logs every bid, call and reveal, and your win-loss record is saved on your device only. Ready to bluff? Roll the dice.