Six statements about a hidden 4-digit code.
Digits are 1–6 and can repeat. Exactly one statement is a lie.
Rule out digits — tap to cross off
Saved on this device
Find the liar. Then find the code.
How to play
A hidden 4-digit code, digits 1 to 6, repeats allowed. You get statements
about it — and exactly one is a lie. Crack it in three attempts, using logic alone.
The core move — find two statements that can't both be true:
3. Position 1 is a 4.
5. Position 1 is a 2. Both can't be true, so the liar is 3 or 5 — which means every other statement is true.
Tap a statement to mark it up as you think:
×struck through — you suspect this one is the lie
✓ticked — you've confirmed it's true
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
Everything you write is kept on your device until the next case.
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.