> There is another version of this puzzle with a third goblin who flips a coin and depending on the outcome he will lie or tell the truth. The player is allowed

> There is another version of this puzzle with a third goblin who flips a coin and depending on the outcome he will lie or tell the truth. The player is allowed 3 yes/no questions But this won't work in the context of the puzzle as stated. The puzzle here requires you to ask about what a goblin will say; your puzzle can't allow that because such a question cannot in the general case be answered yes/no.