Halloween at the Portal. The Hollow, a haunted cipher maze, is free to play until 2 November. Enter The Hollow

3D MAZES

Walk the code. Find the terminal beside each gate, break its cipher, and the gate opens.

🔒 The Crucible is an Elite maze

Elite opens every maze and every premium chain, with unlimited workbench steps, saved recipes and no ads.

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Choose a maze

Walk as a guest · free account to solve

See what's new. Each maze is the same for you every time you come back, and you return where you left off. Data fragments (◆) each carry a piece of a hidden message: collect them all and decode it at the archive by the exit for bonus points.

The Hollow A haunted maze by lantern light. Something taps on the walls in Morse, and ghosts walk the corridors. Collect the jack-o'-lanterns. Elite members can open the Crypt. Free for Halloween · 4 gates + wing · Haunted ▶ Enter The Construct Three gates, three ciphers. Each answer opens a gate and is the key to the next terminal. Free · 3 gates + wing · Classic ▶ Enter The Ledger A maze built from blocks. Four gates ask you to do what a node does: hash, check, combine and mine. Elite · 4 gates · Blockchain 🔒 Elite: see plans The Mainframe The oldest machine in the system moves letters and masks them. Rail fence, columns, XOR and raw binary. Elite · 4 gates · Ice 🔒 Elite: see plans The Redline A train that never stops. Break a cipher by counting its letters, then chase the key through three more. Elite · 4 gates · Redline 🔒 Elite: see plans The Source The hardest maze. Five gates, every one locked at least twice. Build the chain that undoes them. Elite · 5 gates · Gilded 🔒 Elite: see plans The Gathering A corn maze at the end of harvest, in the last gold light. Follow the notes left for the late arrivals, collect the slices of pumpkin pie, and mind the turkeys. Elite members can open the Root Cellar. Elite · free at Thanksgiving · 4 gates + wing · Harvest 🔒 Elite: see plans The Whiteout A frozen maze in falling snow. Follow the notes a lost traveller left behind, collect the snowflakes, and watch for black ice. Elite members can open the Ice Vault. Elite · free at Winter · 4 gates + wing · Frozen 🔒 Elite: see plans Cold Storage A server farm behind laser gates. Nothing is written in letters here: hexadecimal, Base64, XOR and raw bits. Elite · 4 gates · Server Farm 🔒 Elite: see plans The Lost Temple Open ruins in daylight, with rubble in the way and a pair of teleport pads. The oldest ciphers there are. Elite · 4 gates · Ruins 🔒 Elite: see plans New The Glass Orchard Step into a greenhouse where code grows like ivy, and follow the gardener's trail through three overgrown gates. Bring a sharp eye and a patient mind. Elite · 3 gates · Classic 🔒 Elite: see plans New The Tidewire Station Step into the drowned halls of Tidewire Station and follow the engineer's trail through four rooms. Something at the end is still waiting to be read. Elite · 4 gates · Ice 🔒 Elite: see plans New The Clockwork Cistern Step into the flooded halls under the city and chase a message through three gates of brass and shadow. Bring a sharp eye and a steady hand. Elite · 3 gates · Ice 🔒 Elite: see plans New The Night Market A rain-soaked city block at night, all tube signs and puddles. Follow the word the stallholders pass along, collect the data chips, and stay out of the drones' searchlights. Elite · 4 gates · Neon Alley 🔒 Elite: see plans New The Drowned Archive A flooded hall under the sea. Follow the directions its keepers left, collect the pearls, and mind the currents: ride them or push against them. Free · 4 gates · Sunken ▶ Enter New The Crucible A forge inside a volcano: basalt walls with glowing cracks, lava at the foot of them, embers in the air. Follow the smiths' orders, collect the embers, and wait out the steam vents. Elite · 4 gates · Foundry 🔒 Elite: see plans New Station Meridian An empty space station, still running. Follow the last log through the ring, collect the data crystals, and time your way through the airlocks under a turning planet. Free · 4 gates · Orbital Station ▶ Enter New The Frostbound Signal Step into a maze of ice-block walls and falling snow, and follow a dying signal past snowmen and slick black ice. Three gates stand between you and the last message. Elite · 3 gates · Frozen 🔒 Elite: see plans New The Violet Rainfall Step into the violet rain and walk its drifting corridors. Four gates wait, and each one keeps a message for anyone patient enough to read it. Elite · 4 gates · Violet 🔒 Elite: see plans New The Sodium Alley Step into the wet dark of Lowmarket and slip past the searchlights. Three gates stand between you and the crew's last message. Elite · 3 gates · Neon Alley 🔒 Elite: see plans

Build your own maze

Elite members can build a maze of their own: hide a message behind each gate, lock it with a chain of ciphers from the Workshop, pick a look, and share the link or submit it to the gallery. Anyone with a free account can play it. Custom mazes are unscored.

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How the mazes work