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

📜 Briefing
An operator aboard a hovercraft is relaying a message out of the Matrix, one hop at a time. Each relay is locked with the word the previous one revealed. You can't skip ahead: without the last answer, the next transmission is just noise.
  1. 1 Hop 1: The Beacon
  2. 2 Hop 2: The Handshake 🔒 opens with stage 1's answer
  3. 3 Hop 3: The Fence 🔒 opens with stage 2's answer
  4. 4 Hop 4: The Exclusive Or 🔒 opens with stage 3's answer
  5. 5 Hop 5: The Last Relay 🔒 opens with stage 4's answer

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Scored puzzles need a free account: your time and hints are tracked by the server, points go on the leaderboard, and each answer unlocks the next stage.

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New here? The five tutorials need no account.