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These key bindings are somehow related to level editing. See Level editor for in-depth coverage of level editing features.
Enable/disable level editor. This can also be accomplished by clicking with the first mouse button while the mouse cursor is within the game screen boundaries (even if it’s not visible).
Undo the previous level modification done. A description of the undone modification is displayed on the message line. If there is no level modification to be undone ‘NO FURTHER UNDO’ is displayed on the message line. This key binding can be used regardless of whether the level editor is enabled or disabled.
Redo the next level modification undone. A description of the redone modification is displayed on the message line. If there is no level modification to be redone ‘NO FURTHER REDO’ is displayed on the message line. This key binding can be used regardless of whether the level editor is enabled or disabled.