Gems
From KeenWiki
Gems are items used to open doors in Keen 4, Keen 5, and Keen 6. They come in the colours red, blue, yellow and green. In order to open a door, the gem is placed in a holder of the corresponding colour. The door then moves backwards, becoming part of the background and allowing Keen to pass.
A corresponding system in Keen 1-3 is the Keycards.
It is unclear whether gems are a more or less advanced technology than keycards or keys, although it would seem that all red gems activate all red doors, so Keen could simply keep 4 gems on his person and never have to look for keys again. Unfortunately, this is not possible in the game.
See also
- Keycard - Keys in the Invasion of the Vorticons series
- Key - Keys in Keen Dreams
- Omegamatic Keycard - Key for accessing locations within the Omegamatic
