Key

Keys were a joke item from Java Edition 3D Shareware v1.34. There are three different keys: red, yellow, and blue.

Mobs
The red key was dropped by the wither, the yellow key was dropped by ravagers, and the blue key was dropped by the elder guardian.

Cheat codes
These keys were also obtainable by using the cheat code "IDKFA" when typing in chat.

Trivia

 * Green Key.png A key with a similar appearance is present in The Europa Arcology Incident, a game made by Notch in 2009.
 * The way you obtain these keys is through typing "IDKFA" in chat the this is a reference to the original DooM
 * IDKFA all so has a meaning, ID referring to id software the company that made DooM and titles like Wolfenstien 3D and Quake, KFA meaning Keys, Full Ammo.

Chave