Show a guard you know a secret, without saying it.

ZARCADEThe Proof Puzzle
CodeYour secret code
Motion

Pick a secret three-digit code. It goes into the safe. The Watcher closes his eyes while you type it, so he cannot see it.

Your code

Set your code

Type three digits into the box. The round starts by itself.

The Safe

Type your code in the box. Three digits start the round.