Software Adventure Games - The Elf's Christmas Adventure v2.0

Description:

The ELF'S Christmas Adventure Game understands a wide variety of commands.
However, it has only a limited vocabulary, totaling approximately four hundred words, so it can get confused.
If you give it a word that it doesn't understand, it will tell you what word it doesn't know.
Try entering your command again using a different word in place of the one the game objected to.