I don't know what kind of dolphin porn is in the extra gigabyte of this ISO but legit game ISO is 2.36 GB: https://sukebei.nyaa.si/view/17834

Actually legit ISO is this one, and https://sukebei.nyaa.si/view/17834 is dummy cut version. Not like it really matters, except that apparently you need NoDVD to play dummy cut version.

If you compare the 2 iso's you will notice a section or file on the larger iso that is named dummy. That dummy folder is removed in https://sukebei.nyaa.si/view/17834. Thus the name dummy cut.

So this is basically the original before dummy cut? I see.