Had a lot of fun 100%-ing V2.0! Though, I have yet to attempt True Impossible, I don't really see much of a reason to. The hardest modes for me personally were Impossible and Ultimate in Arty's Memoir, and the Extreme Elevator in Elaine's Memoir.
The Extreme Elevator took me awhile and was by far the hardest mode in Elaine's Memoir, but I eventually got it. I shared some of the same problems you mentioned, namely being unable to see some of the differences at all, but after enough time I at least found it easier to narrow it down to which rooms weren't different so that guessing was more lenient as a last resort, and just scanning for anomalies quickly as it gets more hectic in general.
The Hide 'n Seek secret trophy should be behind a wall in the last room, by the weird wooden planks(?). If it proves difficult, just double and triple check every wall in that last room, it shouldn't take much longer to find.
it's after the bug fix and the str-dos entries are empty for me, is this still intentional?
and also I found a weird error where I used the skip to Room 750 code just cuz I thought it'd be funny but it actually let me past the end cutscene into the later rooms, that definitely ain't intentional
