Key

Use
Keys are used to unlock small locked doors in dungeons. Each key can only be used once and will be consumed upon unlocking a door. Keys can only be used in dungeons that they are found in and the current key count can be found to the right of the coin count at the top of the screen.

Obtaining
Keys may be obtained in various ways:
 * Opening chests in dungeons
 * Defeating all enemies in a room
 * Solving a puzzle in a room