Verifiers
Note sheet
Digit map
Just a memory aid — doesn't affect the puzzle. Click a cell to cross it out · Right-click (or long-press on touch) to mark it as a candidate (blue circle). A cell can be both.
A code-breaking deduction game
Crack a code by questioning a set of verifiers and deducing.
Just a memory aid — doesn't affect the puzzle. Click a cell to cross it out · Right-click (or long-press on touch) to mark it as a candidate (blue circle). A cell can be both.
The code was:
Only the code that satisfies all verifier criteria will win. You can keep playing if you're not ready yet.
Anyone who opens this link will play the exact same puzzle as you.
Paste a game ID or a shared URL.
The code is three digits — each between 1 and 5. The first digit is marked blue, second digit is yellow, and third digit is purple
Each Verifier (A, B, C…) checks one secret criterion. Each verifier card shows the topic and a list of possible criteria — exactly one is the real one. Your job: deduce which.
Each round:
When you think you've identified all criteria, work out the unique code that satisfies them all, and press Submit code. Fewer total questions = better score.
There is always exactly one code that satisfies every criterion, and no verifier is superfluous — you need all of them.
In Hard+ you face 5 verifiers drawn from the full rule pool, with at least 3 of them being "which color does X?" templates — e.g. "A specific color is the sum of the other two" with options Blue = Yellow + Purple / Yellow = Blue + Purple / Purple = Blue + Yellow. The puzzle picks which color is the real one. For those color-rules, Ask works on any proposal (even when 0 or many options match) — the verifier just answers YES or NO, and the system only auto-marks options when exactly one of the card's options matches your number.
In Extreme games each verifier shows two criteria cards — but the verifier only tests one of them. You have to deduce both which card is the active one AND which option on that card is the real criterion. The Ask rule still applies across both cards together: you can only Ask when exactly one option across the entire verifier matches your number.
And there's a twist: one extra verifier in the lineup is a red herring — its hidden criterion was deliberately chosen to NOT match the true code, so it always answers NO on the actual solution. You don't know which slot is the herring. Use your queries to spot the verifier whose answers contradict the rest, and ignore it.
Auto-deduction in Extreme is intentionally quieter: a card is marked dead (⊘) only once every one of its options is ruled out, and an option is auto-confirmed only when it's the last possibility across both cards combined.
This ends the current game. You'll see the correct code and the criteria, but it counts as a loss.
Choose a code and a level. The puzzle generated will have YOUR code as the unique solution — share the game ID so friends play your puzzle.
Pick a digit range and how many verifiers to fight.
Checking configuration…