Legendary Truth

When the apocalypse starts, the entire 4th layer of the board is destroyed and removed from the game. Each tile in the remaining 3 layers will be assigned a digit. This sequence of 25 digits will be the password. End your turn in a tile to privately learn its digit. On each GM turn, a digit is called and every tile holding it is destroyed. After each purge, any player may try to guess the full 25 digits: Guess right and you win instantly; guess wrong and you lose your entire next turn, learning privately which digits were right and which weren't.