Six statements about a hidden 4-digit code
(digits 1–6, repeats allowed). Exactly one is a lie.
Rule out digits
Tap once to cross off · tap again to pick
Saved on this device
Find the liar. Then find the code.
How to play
A hidden code of 3 or 4 digits depending on the section, each digit 1 to 6,
repeats allowed. You get statements about it — and exactly one is a lie.
Crack it using logic alone — three attempts on Easy, two on Medium and Hard.
Three sections, played in order. Each one is a numbered run of cases.
Finish a case to open the next one; every case you have reached stays open to replay.
How to work it out. Take each statement in turn and ask:
if this one is the lie, do the others agree on a single code?
Only one statement survives that test — and the code it leaves is the answer.
1. Position 1 is a 1.
2. The highest digit is 3.
3. The lowest digit is 4.
4. Position 3 is a 2. Statement 3 cannot sit with statement 1 — if position 1 is a 1, the lowest
digit is not 4. So 3 is the lie, the rest are true, and the code is 132.
Stuck? Open the scratchpad. The SCRATCHPAD button under the statements
gives you a notepad and a grid for crossing off digits you have ruled out:
P1123456
P2123456
Each guess tells you two things:
▮how many positions are correct
✗how many statements your guess breaks
The right answer breaks exactly one statement — because there is exactly one lie.
Breaking zero means your code is too perfect to be right.
Run out of attempts and the code is shown, the case is marked missed, and the
next one opens anyway. Come back to it whenever you like.
Easy cases
Finish a case to open the next. Every case you have reached can be replayed.