Liar's Dice Rules: How to Play, Bidding, Wild Ones and Odds

Five dice under your cup, and only you know what they show. Liar’s Dice has everyone bid on dice they can’t see until someone calls Liar and the cups come up. The Liar’s dice rules fit on an index card, but the game rewards anyone who can count and keep a straight face. Here is how a round works, how bids go up, what wild 1s change, and the real odds behind every bid.

Key takeaways

Each player has five dice hidden under a cup, and every bid is about all the dice on the table, not just your own.
A bid names a quantity and a face, such as “four 5s”, and each new bid must be higher than the last.
Instead of raising, you can call Liar: all dice are revealed, and whoever was wrong loses one die.
In many games 1s are wild and count toward every other face, which doubles the odds for any regular bid.
The last player with dice left wins the game.

What you need

The Liar’s dice game needs five ordinary six-sided dice and one opaque cup per player. Two players can play, but it gets better with four to six, because more hidden dice means more room to bluff.

The family has many names. Wikipedia’s Liar’s dice article traces it to Dudo, a bluffing game from South America, and Perudo is another common name for the same style of play. The version below, where everyone bids on the total of all the dice, is the one most people play. Wikipedia files it under “single hand” play. Its “common hand” version is a different, poker-style game for two players.

How to play Liar’s Dice: a round

Every round follows the same pattern.

Shake. Everyone shakes their cup at the same time, slams it down and peeks at their own dice.
Open. The starting player makes the first bid: a quantity and a face, such as “three 4s”. That bid claims there are at least three 4s among all the dice on the table, the bidder’s own included.
Raise or challenge. Play moves clockwise. Each player either makes a higher bid or calls Liar on the current one.
Reveal. When someone calls Liar, every cup is lifted and the dice of that face are counted.
Lose a die. If the count is lower than the bid, the bidder loses a die. If the count is equal or higher, the caller loses a die.

The player who lost the die starts the next round, or the next player in turn if the loser is out of dice. Everyone re-rolls, and the game goes on until only one player has dice left.

Bidding rules: what counts as a raise

The widely used raise rule is simple. A new bid must have either:

a higher quantity of any face (“four 5s” can become “five 2s”), or
the same quantity of a higher face (“four 5s” can become “four 6s”).

So after “four 5s”, “four 3s” is illegal, while “four 6s” and “five 1s” (with wild 1s off) are fine.

Wikipedia lists other variants. In one, you either raise the quantity of the same face or switch to any quantity of a higher face. In the strictest, you need a higher quantity of the same face or the same quantity of a higher face. Agree on your rule before the first shake, because arguments about legal bids are the fastest way to stall the game.

Wild 1s and bidding on 1s

In many Liar’s dice rules, 1s are wild. A 1 counts as whatever face is being bid, so if the bid is “six 4s”, every 4 and every 1 on the table count toward it. That makes the 1 the most useful face to hold.

Players can still bid on 1s themselves, but under the Dudo rules described on Wikipedia, the quantity converts:

Onto 1s: you may halve the quantity, rounding up. After “five 3s”, the lowest bid on 1s is “three 1s”.
Off 1s: the next bid on a regular face must be at least double plus one. After “three 1s”, the lowest bid on 4s is “seven 4s”.
No opening on 1s: the first bid of a round can’t be on 1s unless the bidder has only one die left.

The conversion exists because 1s only count as themselves, so there are on average half as many of them as of a regular face with wilds included. Without wild 1s, 1s are just the lowest face.

Calling Liar and spot on

A challenge is the only way a round ends, and calling Liar (“dudo” in Dudo, Spanish for “I doubt”) is the standard one. You can only challenge the bid just made, on your turn. Count the dice of the bid face, add the 1s if they are wild, and compare.

Many groups add a second call, usually named spot on (calza in Dudo). Instead of saying the bid is too high, you claim it is exactly right. According to Wikipedia’s Dudo article:

If the count matches exactly, the caller wins back a die they lost earlier.
If it doesn’t, the caller loses a die, or two under some house rules.
The bidder never loses a die on a spot-on call.
It can only be called while more than half of the starting dice are still on the table.

Spot on is a long shot most of the time. With 15 hidden dice and wild 1s, even the single most likely exact count comes up only about one time in five, as the odds section below shows.

Liar’s dice odds: how likely is a bid?

Every die you can’t see is an independent roll. Without wilds, each hidden die shows a given face 1 time in 6. With wild 1s, it counts if it shows that face or a 1, so the chance is 1 in 3.

That makes the expected number of a face among the hidden dice easy to work out: divide the hidden dice by 6, or by 3 with wild 1s. Wikipedia notes that a bid at that expected count, rounded down, is more likely true than false.

For the exact chances, use the binomial formula. The chance of exactly k matches among n hidden dice is C(n, k) × p^k × (1 − p)^{n − k}, and the chance of at least k is the sum of that from k up to n. The table below runs it for 15 hidden dice, which is what you face in a four-player game at full strength (20 dice, five of them yours).

Matches needed among 15 hidden dice	No wilds (p = 1/6)	Wild 1s (p = 1/3)
At least 1	93.5%	99.8%
At least 2	74.0%	98.1%
At least 3	46.8%	92.1%
At least 4	23.2%	79.1%
At least 5	9.0%	59.6%
At least 6	2.7%	38.2%
At least 7	0.7%	20.3%
At least 8	0.1%	8.8%

A quick check: with no wilds, the chance of at least one match is 1 − (5/6)¹⁵ = 1 − 0.065 = 93.5%. With wild 1s, the expected count is 15 ÷ 3 = 5, and at least 5 comes up 59.6% of the time, just above even money, as the rounded-down rule predicts.

A worked example

Four players, all with five dice, 1s wild. You hold 2, 5, 5, 1 and 3. Toward 5s you already have three: two 5s and the wild 1. The other 15 dice should hold about five more, so a bid of “eight 5s” is right on the expected total.

“Seven 5s” needs 4 of the 15 hidden dice: 79.1%. A comfortable bid.
“Eight 5s” needs 5: 59.6%. Reasonable.
“Nine 5s” needs 6: 38.2%. If someone else bids this, a Liar call is in your favor.
“Exactly eight 5s” for a spot-on call needs exactly 5 hidden matches: C(15, 5) × (1/3)⁵ × (2/3)¹⁰ = 3003 × 0.00412 × 0.01734 = 21.4%.

The raw odds are only half the story. A player who bids 5s probably holds some, so a bid is usually a little more likely than the binomial number suggests.

Strategy tips

Open on your best face. Bidding on what you hold gives you a cushion if the bid comes back around, and you know part of the count before anyone else does.

Bluff early, not late. A small bluff on a face you don’t hold can send the table the wrong way while the bids are low and nobody wants to challenge. Late in a round, when bids sit near the expected total, a bluff gets called.

Watch who sticks to a face. A player who raises the same face twice is usually holding it. A sudden switch can be a way to dump a high bid on the next player.

Count dice as they disappear. As players lose dice, the expected count drops. A bid of “six 4s” is safe with 25 dice in play and reckless with 12.

Common variations

Palo fijo: in Dudo, when a player first drops to one die, the next round has no wild 1s and only one-die players may change the face being bid.
Common hand: a two-player version played with poker-style hand rankings, where players call ever-higher hands and challenge bluffs. It is closer to poker than to the table-wide count above.

Play Liar’s Dice online

The quickest way to learn the odds is to play. Our free Liar’s Dice game puts you at a table with two to five computer players who bid from their own dice and the binomial odds, and bluff now and then. Wild 1s with the halving and doubling rule are on by default, spot on is an option, and an odds hint shows the expected count and the chance the current bid is true.

For a dice game with no bluffing at all, fill a scorecard in Yahtzee.

Frequently asked questions

Are 1s wild in Liar’s Dice?

Often, but not always. In Dudo-style play the 1s are wild and count toward any other face, and bidding on 1s uses the half-and-double conversion. Many casual groups play without wilds, so agree before you start.

Who loses a die when someone calls Liar?

Whoever was wrong. If there are fewer dice of that face than the bid, the bidder loses one. If the bid is met or beaten, the player who called Liar loses one.

Is Liar’s Dice the same as Perudo?

They are the same family. Perudo and Dudo are names for the South American version, which uses wild 1s, the conversion rule for bidding on 1s and the exact “calza” call. Liar’s Dice is the broader name, and house rules vary more under it.

Conclusion

Liar’s dice rules come down to three moves: bid on the whole table, raise the last bid, or call Liar. Wild 1s and spot on add depth, and a little binomial math tells you when a bid is safe and when it’s a bluff. Try a few rounds against the computer, and when you want a break from bluffing, the Chrome Dino game on our homepage is a jump away.

How to Play Liar’s Dice: Rules, Bidding and Odds