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 — 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 1801–2400 · Nothing collapses easily — expect to rack your brain every step of the way.
EXTREME 2401+ · For elite solvers only.
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.
STEP BY STEP EXAMPLE
PUZZLE CLUES
- A + B = 7
- B * C = 24
- C > D
- D – E = 5
- F + E = 6
STEP 0 / 7
Ready to begin
Press Next Step to start the walk-through.
Watch the grid update as each deduction is made.
GIVE UP?
Are you sure? In Rated mode, giving up counts as a loss and will decrease your rating.
✓ PUZZLE SOLVED
Casual mode — rating unaffected
SHARE VIA
CASUAL
00:00
CLUES
PUZZLE RATING
- Generate a puzzle to see clues
SOLUTION
A =
B =
C =
D =
E =
F =
ELIMINATION GRID
LEFT CLICK: Toggle cell
RIGHT CLICK / CTRL+LEFT CLICK: Set Value
RIGHT CLICK / CTRL+LEFT CLICK: Set Value
August 26, 2026
- Updated the hint system.
- Column elimination button [X] size adjusted.
August 25, 2026
- Difficulty labels now appear above the clues and in the puzzle completion window.
- Solve History on mobile now displays the date column.
July 23, 2026
- Multiple incorrect CHECK attempts of the same previously attempted solution no longer count as additional mistakes.
July 22, 2026
- Reduced generation time for EXPERT and EXTREME puzzles.
July 20, 2026
- Select Difficulty now includes rating ranges up to 2600+ for RANDOM puzzles.
- Puzzles rated 2401+ are now grouped into a new EXTREME difficulty tier.
- Hard, Expert, and Extreme puzzles (in RATED mode) must now be unlocked by reaching the required player rating.
- Improved the puzzle difficulty rating algorithm.
- Updated the hint system.
SOLUTION