H2G2 was medium difficulty compared to Starcross and Deadline, it just required patience. And MAN was it satisfying to win as a 13 year old. Long before accomplishments were measured in twitch response rather than deductive logic.

Spellbreaker, OTOH, was potentially impossible. It had two puzzles early in the game that were solvable by irreversible methods that made the game unwinnable. (One was casting Girgol to stop time allowed you to solve the Ogre puzzle, but you needed that spell at the very end, can't recall the other).