Gems
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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.
