Deduction Desk

Deduction Desk is a logic grid puzzle app for anyone who loves solving cases with pure reasoning — not jigsaw pieces.
Each puzzle gives you several categories (people, places, objects, times, and more). Every item matches exactly one partner in every other category. Read the clues, mark what is possible or impossible, and work out the only answer that fits.
HOW IT WORKS
• Read the clues — each one links items from different categories
• Open the deduction grid and tap pairs to cycle: ? → possible → impossible → confirmed
• Confirm one match per row in each category tab
• Press Check solution when you think the case is closed
FEATURES
• Built-in sample cases from Easy to Hard
• Detective desk theme with parchment cards and clue scraps
• Create your own puzzles with the case editor
• Add categories, write clues, and set the solution
• Validate puzzles before sharing or playing
• Search your case list quickly
• Works fully offline — no account required
• Progress saved automatically on your device
SAMPLE CASES
• Lab Badge Mix-Up — four researchers, snacks, and lab stations
• Rooftop Signal — agents, devices, and secret code names
• Museum Night Shift — guards, exhibits, times, and tools
Whether you are new to logic grids or already hooked on deduction puzzles, Deduction Desk gives you a clean workspace to think through every clue and close the case.