Stash Sudoku

The Ninefold Keepers once encoded each gateway with a single royal signal. When the signals began contradicting one another, the gates locked travelers out. An arcade caretaker discovered that nine independent channels could agree without repeating the same value.

The journey runs through seventeen circuits, orbital relays and rune towers. Its last five hard ciphers protect treaty seals, a cathedral beacon, an undead register and the Winterglass correspondence. Solving them restores the right to cross without giving one keeper control of every door.