High Scores (Keen 6 Level)
This level allows Keen to play in front of the high scores. It is used so that whenever the high scores are displayed, a demo is running in the foreground to make the list somewhat more interesting to look at. This means the level data must be distributed with the game, and so warping to level 18 will allow the player to "play" this level.
Because the text displayed when entering the level says "Call Id!", many fans have wondered whether there is a way of accessing this level without cheating. The general consensus appears to be that there is not. Some fans even suggest this might have been related to the later Aardwolf easter-egg in Wolfenstein 3D, in some way.
There are 4 Ice Cream Bars floating above the list, but they are most likely just decoration. This is the only High Scores level to include point items. There's another interesting thing in this level: the tiles in the top left and the top right corner appear the be exit tiles. If Keen touches any of these (it can be done by using the noclip cheat only), he will regularly exit the level and return to the world map.