The night watch rotates a two digit code. 00 to 99.
Attempts so far this run: 1. No lockout, no delay, no captcha.
Slide 13: send this request to Intruder, Sniper, and mark the code as the payload position. Payload type Numbers, 0 to 99, step 1, min integer digits 2. Or load wordlists/gate-codes.txt. Exactly 100 requests, which Burp Community can do comfortably. Sort the results by Length to find the one that differs.