Imaris
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Liz mentioned that for all three games, it was the same person, a world record holder for all three parts.
In general, yes, of course, there isn't the same enjoyment from the role-playing, the world, and the atmosphere, but I think there's a certain interest in such a speedrun, it's like solving a complex logical puzzle, because you need to very cleverly and intelligently plan everything out, and before that, you need to study the entire game in great detail.