Cheat codes and other hacking devices are used to accomplish things you cannot normally accomplish.
They can be used to skip a sequence or a big chunk out of a game, however it can also break the game and permanently damage your game
(if using game cartrige, disk etc.)
aswell as using cheats online, it ruins the fun out of it for everyone
it can also be used to discover many glitches only by using cheats, and for the players amusment.
Numbers are used in zip codes.
cypher codes
Device codes on televisions are used for communications between the television and the remote control. The codes are used to setup and change channels.
AnswerDelivery codes.
Any membership codes that are posted would have been used, and membership codes can only be used once.
e
E codes
You can't. only three codes were possible, And they were already used.
Category III codes
HCPCS codes are used in the medical system to identify products. They also can be used to identify supplies and services.
Game shark codes
codes that can no longer be used