You are about to take part in an adventure in the Death Zone on Gallifrey. As you were passing through this plastic model you heard about the abundance of Grassy plains. Your mission is to try to destroy four Doctors before they reach Rassilon’s Tower. Being the MASTER can you achieve your evil aim and win 13 more regenerations! You are likely to meet evil aliens, problems and even large hairy Yeti! To be successful you must realise that everything in the adventure has a purpose, and should, in a small way, help you in trying to complete your mission.
Not at all based on The Twin Dilemma, the final story in season 21 (1984) of Doctor Who as the title might otherwise suggest!
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This actually has nothing to do with the story "The Twin Dilemma" - there is no mention of a giant gastropod, and the word twin only appears in the title.
Like several other text adventures, The Five Doctors seems to be the inspiration. It's not the only one to cast the Master as the protagonist, either!