The Mystery of Silver Mountain © 1984 Usborne Publishing.
Text adventure, it use two-word commands. The vicious Grarg army has taken control of the villages at the foot of the Silver Mountain. You must find the magical objects that will allow you to enter the Silver Chamber inside the Palace on Silver Mountain, then utter the magic words to regain control of the Stone of Destiny.
It requires a 16K expansion.
Published as a type-in program in the british book; The Mystery of Silver Mountain.
Game's listing.