I finished the original
Safecracker without a hint, and, if you don't count the occasional comment by Arthur, I didn't have to look up anything in
Journeyman Project 3. I
almost made it through
Riven, except for the fire marble puzzle. I had the grid correct but just couldn't figure out why I wasn't making any progress. After two trips around the islands and numerous disk changes, I checked a walkthough only to discover
Spoiler:the button I missed that was right in front of my nose.