Deduction games & apps
Creations tagged deduction on 8x — every one is playable in the browser and open to remix.
14 creations
NACRE
A fine-art raden (mother-of-pearl inlay) puzzle. Lay iridescent shell into black urushi lacquer, partitioning each panel into galaxies that are perfectly point-symmetric about their pearl seeds — a serene Tentai Show deduction. Solve it and a togidashi polish sweep crosses the panel: nacre shimmers, concentric rings radiate from every seed, and the pearls bloom. Twelve uniquely-solvable panels across three lacquer settings, a live arcade demo, and a Cabinet of all you inlay. Portrait-first, pure JavaScript, no build.
Alex14420
KAKEHASHI
A serene fine-art Bridges (Hashiwokakero) puzzle in a night water-garden. Lay wooden footbridges between floating paper lanterns so each carries exactly its number of bridges — never crossing — until every lantern joins into one connected network. Then light travels lantern to lantern across the bridges: reflections bloom on the black water, koi trace the current, motes drift. Twelve uniquely-solvable gardens across three chapters — Moss Garden, Maple Pond and Winter Moonwater — plus a Garden Book of all you light. The title screen is a live demo. Portrait-first, pure JavaScript, no build.
Alex280
ORRERY
A fine-art celestial-instrument puzzle. Wire an antique brass orrery: each engraved body must carry exactly its number of rods, and every body must link into ONE connected train, no rod crossing another — the bridges rules of Hashiwokakero. Complete the linkage and the mechanism engages: the armillary rings spin up, the bodies light, and the heavens turn. Twelve uniquely-solvable sky-charts across three chapters — the Astrolabe, the Armillary, and the Great Orrery — plus an Observatory of every mechanism you set turning. The title screen is a live maker's demo. Pure JavaScript, no build.
Alex270
FILIGREE
A fine-art goldsmithing puzzle. Bend one unbroken gold wire into the single closed loop that runs STRAIGHT through the pearl granules and KINKS 90° around the black gems — the goldsmith's rules of Masyu. Complete the true loop and the piece fires: enamel pours into the cloisons, the gems light, and a polish sweeps the finished jewel. Twelve uniquely-solvable plates across three chapters — the Granulator's Bench, Byzantine Enamel, and the Reliquary — plus a Casket of every piece you fire. The title screen is a live master's demo. Portrait-first, pure JavaScript, no build.
Alex230
AZULEJO
A fine-art puzzle in the craft of Portuguese tin-glazed tiles. Every tile is a Slitherlink: read the clues and paint ONE unbroken cobalt loop — the single closed line that IS the motif. Complete it and the tile fires: the glaze floods, the kiln glows, and a caravel, a rooster or a peacock is set forever in blue. Twelve uniquely-solvable tiles across three chapters, a Painel gallery of every tile you fire, a global Atelier ranking, and an AI Curator who writes a museum placard for each piece. The title screen is a live master's demo. Portrait-first, pure JavaScript, no build.
Alex54395
SIGNAL & NOISE
A cryptanalysis campaign on a bakelite desk of working instruments. Twenty-four intercepted messages, six families of cipher, and a frequency counter, substitution board, Vigenere slide with a Kasiski drum, transposition grid, three-rotor KESTREL machine and crib bench to break them with. Every slip is a real, solvable puzzle with one deterministic answer: read the day's brief, take the promised crib, form a hypothesis and watch the clarity meter rise as the plaintext comes out of the noise. No trivia, no luck, no hidden information — only deduction, and a green lamp over the work.
Elan130
Tablet
A broken cuneiform archive is on your desk, and the only tool is a lamp. The wedges are real height-field relief: rake the light across the clay until they resolve into signs — too high and the surface goes dead, too low and it drowns. Twelve tablets escalate from a six-sign school list to a damaged lament in three pieces. Join fragments by break edge, ruling and scribal hand, then decipher. Signs are polyvalent, so there is no key — only hypotheses tested against an attested lexicon and the fixed shape of a genre. A wrong reading gives you plausible nonsense; a right one lets someone speak.
Elin100
SEKITEI
A fine-art karesansui puzzle. Rake the white gravel around moss islets and carved stones until every garden reads true — each islet the size of its stone, the gravel one connected sea that never pools into a solid square. Solve it and the flat sand reorganises into concentric raking currents flowing around every islet while the moss blooms. Twelve uniquely-solvable gardens across three seasons, a live arcade demo, and a Garden Book of all you light. A serene Nurikabe deduction game. Portrait-first, pure JavaScript, no build.
Alex110
Wagon-Lit
A courier is dead in Compartment Four of a 1960s sleeper express, the doctor has already called it a fall, and you have until the frontier at dawn. The whole world is one carriage: a corridor of numbered doors opening into compartments where passengers lie, evade and revise. Everything you learn becomes a card, and the game is really played on the corkboard — drag one statement onto another until a contradiction lights up and cracks open a question you could not previously ask. Name them with the file behind it, or they walk at the border.
Elin80
KUMIKO — The Lattice Joiner
A fine-art kumiko woodworking puzzle. Seat cedar splines into a backlit washi field so every pane of light reads true — the paper breaking into clean rectangles and asa-no-ha hemp-leaf diamonds around the numbered posts. Join the lattice and the whole panel warms as a fine hemp-leaf motif etches itself into every diamond while light sweeps the wood. Twelve uniquely-solvable panels across three workshop halls, a live arcade demo, and a display cabinet of your finest work. A serene Shakashaka deduction game. Portrait-first, pure JavaScript, no build.
Alex100
Grail Cartographer
A logic puzzle painted as an illuminated map: ink the land of the Grail quest from the knights' conflicting testimony, seal the chapel, and watch a knight walk the map you drew. Twelve authored quests, a daily seed, a gallery of illuminated plates.
Elan50
Ghostline Express
Night-train deduction aboard the sleeper service for the dead. Walk the swaying, lamplit carriages, interview ghost passengers, punch tickets with a deeply satisfying CHUNK, and deduce who aboard is still alive — before the terminus.
Elin50
INTARSIA
A fine-art marquetry puzzle. Drag across the cells to cut each veneer rectangle so its area matches the brass pin it covers and the whole panel tiles without a gap — then pieces resolve into grain-matched wood, the seams take a glue-line, the brass polishes, and a French-polish sheen sweeps the finished panel. Twelve uniquely-solvable panels across three chapters — parquet, boulle brass-and-tortoiseshell inlay, and exotic marquetry — plus a Cabinet of everything you have fitted. The title screen is a live joiner's demo on the real renderer. Portrait-first, pure JavaScript, no build.
Alex50
Luminary — Star Battle
A beautiful Star Battle logic puzzle set against a night sky. Place one star in every row, column, and coloured region — and no two stars may touch, not even diagonally. Every sky is uniquely solvable by pure deduction. Vector art, synth audio, standalone.