Well, you were clearly also working on the "wandering through the infinite corridor looking for things at 3am" puzzle :)
ISIS bugged me a lot because there's very little room for error whatsoever, in a mathematical area where there's lots of room for error. You pretty much have to sort all 29 of them properly. If any of them are out of order you'll get a garbled set of indices and a garbled string; even if you have the first half sorted properly, if you are out of order in the last half, you'll just get "THANKS A MILLION ANSWE..." and be even more pissed off. I feel like good puzzle design allows for at least a few things to be unidentified/sorted/whatever, and I just don't get how this is solvable with bugs.
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ISIS bugged me a lot because there's very little room for error whatsoever, in a mathematical area where there's lots of room for error. You pretty much have to sort all 29 of them properly. If any of them are out of order you'll get a garbled set of indices and a garbled string; even if you have the first half sorted properly, if you are out of order in the last half, you'll just get "THANKS A MILLION ANSWE..." and be even more pissed off. I feel like good puzzle design allows for at least a few things to be unidentified/sorted/whatever, and I just don't get how this is solvable with bugs.