Specific codes are required to solve puzzles or unlock secret skins:

Associated with the "Bittersweet" quest for the Mrs. P skin; a specific code ( ) must be entered into a table to retrieve the Heart Key. Additional Modes: It also appears in Distorted Memory and is an available item in Build Mode Related Code Mechanics While the Key Code item is a single card,

The phrase "piggy key code" typically refers to a passcode or a specific key-related item in the Roblox game

The Piggy key code is the great equalizer in Roblox Piggy. It doesn't matter how fast you run or how many weapons you have; if you cannot solve the keypad, you do not escape.

If you see a clock or timer on the wall, the code is the numbers showing. Enter them exactly as they appear (including leading zeros).