Most commonly used cipher tables by english speaking countries. CAESAR, ATBASH, and A1Z26. You cau use theese for decoding those codes in the end credits and other parts of Gravity falls episodes and a few other shows (if they havent been taken out yet) Lol i have alot of time on my hands XD. Start from the first episode to the last because some require using more than one table in a row and switching between tables. Some use all three at once.