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

3 stages · Hard · free account

LOGIC TO CIPHER CASCADE

  1. 1 Stage 1: Identity Logic Grid
  2. 2 Stage 2: Letter Position Encoding 🔒 opens with stage 1's answer
  3. 3 Stage 3: Multi-Caesar Cipher 🔒 opens with stage 2's answer

Log in to play

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.

Create a free account Log in

New here? The five tutorials need no account.