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Word Grouping

Partition 16 fixed words into four exact spelling-rule groups with a uniquely verified solution, accessible controls, and deterministic scoring.

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How to use

  1. 1.Inspect the 16 uppercase words for exact character patterns such as a fixed prefix, fixed suffix, adjacent repeated letters, or reversal symmetry.
  2. 2.Select four words by tapping them or moving with the arrow keys and pressing Space; use Delete or Clear selection to revise the set.
  3. 3.Submit each exact four-word group, lock all four groups, and finish the unique partition for exactly 1,000 points.

About Word Grouping

Word Grouping Puzzle presents 16 fixed words in a deliberately mixed four-by-four board. Select four words that follow one exact rule, submit them, and continue until all four groups are locked. Every accepted group earns 250 points, so completing the unique four-group partition produces exactly 1,000 points. The board is deterministic: its word order, rules, answer groups, error behavior, and score do not change between visits.

This fixture avoids subjective themes and hidden cultural associations. Every group is defined by a visible character operation that can be checked directly from the uppercase spelling. One group begins with the exact prefix SUN. One ends with the exact suffix LIGHT. One contains at least one pair of identical adjacent letters. One reads exactly the same after all of its characters are reversed. No dictionary meaning, general-knowledge category, brand, quotation, or outside taxonomy is required.

The SUN group is SUNBEAM, SUNBIRD, SUNDEW, and SUNRISE. Each begins with the three characters S-U-N, and none of the other 12 fixture words does. The LIGHT group is DAYLIGHT, GASLIGHT, SKYLIGHT, and TWILIGHT. Each ends with L-I-G-H-T, and none of the other words has that suffix. These groups rely only on fixed prefix and suffix comparisons.

The adjacent-double group is BALLOON, COFFEE, KITTEN, and RABBIT. BALLOON contains LL and OO, COFFEE contains FF and EE, KITTEN contains TT, and RABBIT contains BB. The rule needs only one repeated pair, though two words happen to contain two. None of the 12 other fixture words contains two identical neighboring characters.

The reversal group is CIVIC, LEVEL, RADAR, and ROTOR. Reversing the full character sequence of each word produces the same word. The test performs literal reversal rather than relying on a label or memorized list. None of the other 12 words equals its reversal. This creates four objective groups without importing semantic reference data.

Uniqueness is proven independently. The test suite implements four fresh predicates without calling the production matching helper: startsWith SUN, endsWith LIGHT, a repeated-character regular expression, and equality with an independently reversed string. It evaluates every one of the 16 words against all four predicates. Every word matches exactly one predicate, and every predicate matches exactly four words.

A separate exact-cover backtracking pass assigns each word to every independently matching rule while limiting each group to four members. It counts completed assignments in which all four groups contain four words. The result is exactly one partition. This proof is stronger than checking that the published answer works: it also rejects alternate partitions under the disclosed rules. The fixed shuffle places group members across different rows so the initial layout does not reveal the answer.

Pointer play is straightforward. Tap a word to select it and tap again to remove it. Once four words are selected, choose Submit four. Correct words move into a labeled solved panel that explains the rule and lists its members. Locked words remain visible in the original board with a muted state but cannot be selected again. Clear selection removes all current choices without affecting solved groups or mistakes.

Keyboard play covers the same route. Arrow keys move a visible cursor through the fixed four-column board. Space toggles the cursor word, Delete or Backspace clears the current four-word selection, and Enter submits. Repeated keydown events are ignored so holding Space or Enter cannot create accidental rapid actions. The board keeps four columns even at a 390-pixel viewport, aligning keyboard movement with visual rows while containing each label inside its button.

Submission distinguishes partial work from completed attempts. Fewer than four selected words returns an incomplete message and adds no mistake. Trying to add a fifth word leaves the existing four unchanged and asks you to deselect one first. A complete four-word selection that does not match one exact group is a wrong attempt. The first distinct wrong selection records one mistake but remains fully editable.

Wrong attempts use canonical signatures. The four selected words are sorted and joined before comparison, so selecting the same four words in a different order is still the same attempt. Resubmitting that unchanged set does not add another mistake. Only a different incorrect four-word set counts as the second error and deadlocks the run. This prevents double-clicks or reordered repeats from unfairly consuming both chances.

Correct submissions never add mistakes. They clear the working selection, lock the matching group, and set the score from the number of solved groups: 250, 500, 750, then exactly 1,000. Once all four groups are solved, selection, cursor movement, clearing, and submission freeze. Deadlock freezes those same actions. Restart is the intentional recovery path and restores the original shuffle with no selections, solved groups, mistakes, or score.

The interface uses the shared game shell and existing site CSS tokens for surfaces, borders, foreground, muted text, accent, and danger feedback. It contains no hardcoded color, remote image, or runtime data download. Native buttons provide focus, selected state, locked state, and descriptive labels. Solved panels expose the rule in text, so feedback never relies on color alone. The shared double-Escape boss key covers the board with the spreadsheet-style screen and restores it with the same gesture.

Everything runs locally in the current browser tab. No word choice, selection, score, or attempt signature is uploaded. The game requires no account, package dependency, remote API, device permission, or paid service. It is recreational spelling-pattern practice, not a vocabulary, literacy, intelligence, educational, or psychological assessment. A 1,000-point result means only that this one disclosed mechanical partition was completed correctly.

Methodology & sources

Define four original groups of four uppercase strings and publish one fixed interleaved 16-word order. Independently implement the four mechanical predicates—SUN prefix, LIGHT suffix, adjacent identical characters, and equality with full reversal—without calling production matching logic. Require every word to match exactly one predicate, every rule to match four words, all 16 words to be unique, and an exact-cover backtracker to count exactly one complete partition. Canonicalize each submitted set by sorting its four words, ignore incomplete submissions, keep the first distinct wrong set editable, deduplicate an unchanged or reordered repeat, and deadlock on the second distinct wrong signature. Lock correct groups for 250 points each, award exactly 1,000 after four groups, and freeze all gameplay input at completion or deadlock.

Frequently asked questions

Does the puzzle depend on subjective word meanings?
No. All four groups use directly testable spelling operations: an exact prefix, exact suffix, adjacent equal characters, or full-string reversal.
Is there exactly one complete partition?
Yes. An independent exact-cover enumeration finds one assignment in which every word matches one rule and every rule receives four words.
Can the same wrong selection consume both mistakes?
No. The four selected words are sorted into a canonical signature. The same set is deduplicated even if selected in another order; deadlock requires a second distinct wrong set.

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