What Kind of Secret Codes Are You Looking For?

"Secret codes" is extremely broad. To help, I need context. Are you looking for:

• Video Game Cheats / Console Commands? (e.g., iddqd in DOOM, testingcheats true in Sims)
• Historical Ciphers? (Enigma, Caesar Cipher, Navajo Code Talkers, Zimmerman Telegram)
• ARG / Puzzle Hunt Codes? (Cicada 3301, Petscop, Game Detective clues)
• Developer / Easter Egg Codes? (Konami Code, GTA phone numbers, Sonic level select)
• Programming / Encoding? (ASCII, Base64, Hex, JWT, API Keys)
• Physical Locks / Safes? (Default factory codes, bypass methods)

Reply with the specific game, system, or context, and I’ll provide the exact information.