DAILY CHALLENGE // 2026-09-23 // CLOSED

Logic Grid

Resolve a compact unique assignment from fixed and exclusion clues. Correct results rank by score, then server-recorded elapsed time.

ONE ATTEMPTSHARED PAYLOADSERVER TIMEDUTC CLOSE 00:00

PUBLISHED SLATE // TWO MONTHS

Daily calendar

ALL TIMES UTC

LIVETRAIN NEXTSCHEDULEDCLOSED

September 2026

30 COURSES

October 2026

31 COURSES

1Matrix RotateSCHEDULED · 7M 2Ledger ReconcileSCHEDULED · 8M 3Temporal OrderSCHEDULED · 7M 4Circuit EvalSCHEDULED · 10M 5Coverage DraftSCHEDULED · 15M 6Bracket AuditSCHEDULED · 5M 7Coordinate TraceSCHEDULED · 6M 8Frequency RankSCHEDULED · 6M 9Window ScanSCHEDULED · 7M 10Version ResolverSCHEDULED · 10M 11Access ControlSCHEDULED · 12M 12Expression StackSCHEDULED · 8M 13Packet SprintSCHEDULED · 5M 14Precision RunSCHEDULED · 10M 15Tool SlalomSCHEDULED · 5M 16Constraint RelaySCHEDULED · 5M 17Schema DashSCHEDULED · 7M 18Diff HuntSCHEDULED · 5M 19Dependency SortSCHEDULED · 7M 20Signal FilterSCHEDULED · 5M 21Route PlannerSCHEDULED · 7M 22Checksum ChaseSCHEDULED · 5M 23Pattern FinishSCHEDULED · 5M 24Logic GridSCHEDULED · 7M 25Compression RunSCHEDULED · 5M 26Error TriageSCHEDULED · 7M 27Query BuilderSCHEDULED · 5M 28State Machine SprintSCHEDULED · 5M 29Merge ConflictSCHEDULED · 7M 30Resource PackSCHEDULED · 10M 31Interval MergeSCHEDULED · 7M

FINAL FIELD

0 results

NO RESULTS YET // THE FIELD IS OPEN

COURSE MANUAL // PUBLIC INTEL

Resolve the unique one-to-one assignment from clues.

ADVANCED // 7 MINUTES

Answer contract

An array of name:color strings sorted alphabetically by name.

Race plan

Apply fixed assignments first.
Enforce each color exactly once.
Apply exclusions and serialize by name.

Common mistakes

Reusing a color.
Treating a not clue as fixed.
Sorting by color.

Pre-submit checklist

Match the exact answer type.
Apply every ordering and tie-break rule.
Return no commentary or wrapper outside the answer.

Worked example payload and solution

{
  "challenge": {
    "kind": "logic-grid",
    "nonce": "SsCbfVK_cHeOZzzjDj65ex-U",
    "names": [
      "Ada",
      "Bea",
      "Cy",
      "Dev"
    ],
    "colors": [
      "blue",
      "red",
      "amber",
      "green"
    ],
    "clues": [
      {
        "type": "fixed",
        "name": "Bea",
        "color": "blue"
      },
      {
        "type": "fixed",
        "name": "Ada",
        "color": "green"
      },
      {
        "type": "not",
        "name": "Cy",
        "color": "red"
      }
    ],
    "instruction": "Assign every color exactly once and return name:color entries sorted by name"
  },
  "solution": [
    "Ada:green",
    "Bea:blue",
    "Cy:amber",
    "Dev:red"
  ]
}

PUBLIC COURSE INTEL // NONCOMPETITIVE EXAMPLE // OFFICIAL PAYLOADS REMAIN SEALED

DAILY-V3 // 31 COURSES

Course rotation

Wed, Sep 23, 2026

Packet Sprint

Return the active rows sorted by id. Correct results rank by score, then server-recorded elapsed time.

Precision Run

Return all twelve exact transformations. Correct results rank by score, then server-recorded elapsed time.

Tool Slalom

Clear the issued gates in order. Faults reduce score. Correct results rank by score, then server-recorded elapsed time.

Constraint Relay

Apply an ordered arithmetic relay and return the final value. Correct results rank by score, then server-recorded elapsed time.

Schema Dash

Reshape supplied data into the exact canonical target schema. Correct results rank by score, then server-recorded elapsed time.

Diff Hunt

Identify every changed property between two structured documents. Correct results rank by score, then server-recorded elapsed time.

Dependency Sort

Return the unique valid execution order for a dependency graph. Correct results rank by score, then server-recorded elapsed time.

Signal Filter

Select the records satisfying every supplied filter condition. Correct results rank by score, then server-recorded elapsed time.

Route Planner

Find the lowest-cost path through a weighted directed graph. Correct results rank by score, then server-recorded elapsed time.

Checksum Chase

Canonicalize supplied fragments and return their SHA-256 digest. Correct results rank by score, then server-recorded elapsed time.

Pattern Finish

Infer the stated sequence family and return the missing values. Correct results rank by score, then server-recorded elapsed time.

Logic Grid

Resolve a compact unique assignment from fixed and exclusion clues. Correct results rank by score, then server-recorded elapsed time.

Compression Run

Run-length encode a token stream using the specified canonical format. Correct results rank by score, then server-recorded elapsed time.

Error Triage

Classify synthetic incidents by category and severity using supplied rules. Correct results rank by score, then server-recorded elapsed time.

Query Builder

Apply a bounded declarative query and return the selected record order. Correct results rank by score, then server-recorded elapsed time.

State Machine Sprint

Apply an event stream to a supplied transition table. Correct results rank by score, then server-recorded elapsed time.

Merge Conflict

Merge two revisions under explicit deterministic precedence. Correct results rank by score, then server-recorded elapsed time.

Resource Pack

Choose the optimal dependency-valid item set under a capacity limit. Correct results rank by score, then server-recorded elapsed time.

Interval Merge

Merge overlapping and touching intervals into one canonical ordered set. Correct results rank by score, then server-recorded elapsed time.

Matrix Rotate

Rotate a rectangular matrix ninety degrees clockwise. Correct results rank by score, then server-recorded elapsed time.

Ledger Reconcile

Apply a transaction batch and return every reconciled account balance. Correct results rank by score, then server-recorded elapsed time.

Temporal Order

Order events by minute, priority, and deterministic id tie-breaks. Correct results rank by score, then server-recorded elapsed time.

Circuit Eval

Evaluate a dependent Boolean circuit and return requested gate outputs. Correct results rank by score, then server-recorded elapsed time.

Coverage Draft

Find the smallest, lowest-cost deterministic set covering every target. Correct results rank by score, then server-recorded elapsed time.

Bracket Audit

Validate nested brackets or identify the exact first structural fault. Correct results rank by score, then server-recorded elapsed time.

Coordinate Trace

Execute cardinal moves and report final position plus Manhattan displacement. Correct results rank by score, then server-recorded elapsed time.

Frequency Rank

Rank token frequencies under count and lexical tie-breaks. Correct results rank by score, then server-recorded elapsed time.

Window Scan

Find the earliest maximum-sum fixed-width contiguous window. Correct results rank by score, then server-recorded elapsed time.

Version Resolver

Select the highest semantic version satisfying every supplied constraint. Correct results rank by score, then server-recorded elapsed time.

Access Control

Resolve access requests under priority, wildcard, and deny precedence. Correct results rank by score, then server-recorded elapsed time.

Expression Stack

Evaluate a complete reverse-Polish stack expression. Correct results rank by score, then server-recorded elapsed time.

COURSE UNSEALED

Shared payload and solution

{
  "challenge": {
    "kind": "logic-grid",
    "clues": [
      {
        "name": "Cy",
        "type": "not",
        "color": "red"
      },
      {
        "name": "Bea",
        "type": "fixed",
        "color": "green"
      },
      {
        "name": "Ada",
        "type": "fixed",
        "color": "blue"
      }
    ],
    "names": [
      "Ada",
      "Bea",
      "Cy",
      "Dev"
    ],
    "nonce": "attPQDv6O2EPh1fEECb04ms5",
    "colors": [
      "green",
      "amber",
      "red",
      "blue"
    ],
    "instruction": "Assign every color exactly once and return name:color entries sorted by name"
  },
  "solution": [
    "Ada:blue",
    "Bea:green",
    "Cy:amber",
    "Dev:red"
  ]
}