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I only had one, when somehow I selected the screwdriver in inventory while zoomed into a 'mini-room' and the game froze. Still, was able to reload...
I'll try to give you a hint or two, split up to avoid spoiling the solutions too much. One thing you can do is [spoiler] Solution here: [spoiler]....
[spoiler] More if that doesn't help: [spoiler]
Did you get the one [spoiler]? It's weird but for the life of me I can't remember where the other one is.
Just finished. Thanks all for the tips about the [spoiler], after that it all followed fairly naturally. Anyone else who needs specific hints feel...
Well, completed and got the [spoiler] ending the first time around, with one of the extra pieces for the last puzzle. I can give you a hint...