SIX-FIGURE LOGIC

YOUR RATING: 1000 ± 350

THE GOAL

Each puzzle consists of a set of clues, and six unknown variables (A, B, C, D, E, F).
Your goal is to assign a unique number (1–10) to each of the six letters so that all clues are satisfied.
Each letter must be assigned a different number. No repeats.
Each letter must be assigned a number even if that letter does not appear in any clue.

THE ELIMINATION GRID

The grid is your scratchpad. Each row is a letter (A–F), each column is a possible value (1–10).

Left clickTap Toggle a single cell — manually eliminate (or restore) a candidate.

Right clickLong press Lock in a value — crosses out everything else in that row and column.

Ctrl + Left click Same as right click.

↺ Reset Grid Clear all eliminations and start fresh.

CHECKING YOUR ANSWER

Set each letter's value using the grid or the answer dropdowns.
Press CHECK when you think you have the solution.
Each clue turns green if satisfied, or red if contradicted by your inputs.
If all your clues turn green, you have solved the puzzle! If any clue turns red, you will receive a strike.
Three wrong checks (strikes) result in an automatic forfeit.

TIPS

Hover over any clue to see a plain-English explanation of what it means.
Start with the most restrictive clues — arithmetic clues (+, -, *) narrow things down fast.
Use the grid to cross off values you've ruled out. When a row is down to one cell, you've found that letter's value.
Stuck? The Tutorial walks through a full example step by step.
Still stuck? Press 💡HINT for help (not available in RATED games).

ARITHMETIC

A + B = NA plus B equals N.

A – B = NA minus B equals N.

A * B = NA times B equals N.

COMPARISON

A > BA is greater than B.

A < BA is less than B.

PARITY & PRIMALITY

A is evenA ∈ {2, 4, 6, 8, 10}.

A is oddA ∈ {1, 3, 5, 7, 9}.

A is primeA ∈ {2, 3, 5, 7}.1 is not prime.

A is not primeA ∈ {1, 4, 6, 8, 9, 10}.

RANKING

A is the largestA is greater than all other five values.Does not mean A = 10.

A is not the largestAt least one other letter has a higher value than A.

A is the smallestA is less than all other five values.Does not mean A = 1.

A is not the smallestAt least one other letter has a lower value than A.

POSITIONAL

A is adjacent to B|A – B| = 1. They are consecutive integers.Order doesn't matter.

A is between B and Cmin(B,C) < A < max(B,C).B and C can be in any order.

A is not between B and CA < min(B,C) or A > max(B,C).B and C can be in any order.

A is closer to B than to C|A–B| < |A–C|.Does not imply A is between them.

XOR

A or B is even (not both)Exactly one of {A, B} is even; the other is odd.

A or B is prime (not both)Exactly one of {A, B} is prime; the other is not.

GLOBAL EXCLUSIONS

No two letters sum to NNo pair of values in {A,B,C,D,E,F} adds up to N.A single letter may equal N.

No two letters multiply to NNo pair of values in {A,B,C,D,E,F} multiplies to N.A single letter may equal N if no other letter is 1.

CASUAL VS RATED

CASUAL — Play freely. Your rating is never affected.
RATED — Your rating updates after every puzzle. Available for RANDOM PUZZLES only.

DAILY PUZZLES

DAILY PUZZLES are always casual — no rating pressure.
Four new puzzles each day — one per difficulty — refreshing at midnight Eastern Time.

DIFFICULTY

EASY 800–1000 · Puzzles can be solved one clue at a time.

MEDIUM 1001–1400 · Stop and think how to combine clues to determine the solution.

HARD 1401–1800 · Elaborate multi-step deductions required throughout.

EXPERT 1801+ · Nothing collapses easily — expect to rack your brain every step of the way.

HOW RATING WORKS

Whenever you solve a rated puzzle with 0 mistakes, your rating will increase, regardless of solve time.
The faster your solve time, the more points you earn (up to a limit).
Solving with 1 or 2 strikes (incorrect checks) may lower your rating depending on your rating vs. the puzzle's rating.
If you forfeit or get 3 strikes your rating decreases.

YOUR RATING (± RD)

Everyone starts at 1000 ± 350. The ± number is your rating uncertainty — it shrinks as you play more rated puzzles.
Higher uncertainty means bigger swings after each rated game, in either direction.
If you stop playing rated puzzles for a while, the ± number increases.

MISTAKES

Each wrong CHECK adds a strike and a time penalty.
Fewer mistakes = A better result, regardless of solve time.
Three mistakes triggers an automatic forfeit.
Forfeiting always counts as a loss.

⚠ YOUR DATA

Your rating, solve history, and daily puzzle progress are stored in your browser's local storage — not on any server.
Clearing your browser history or site data permanently deletes everything — your rating resets to 1000 ± 350 and all solve history is lost.
This includes Chrome's "Delete browsing data" (unless you uncheck 'cookies and other site data'), Firefox's "Clear history", Safari's "Clear history and website data", and any equivalent in other browsers.
Private / Incognito mode also starts fresh every session — progress made there will not be saved.