Very fun! I was able to complete the first room on my own. After that I was floored. Had to constantly use walkthroughs, but it was still fun. Though, there were a few puzzles that seemed very unlikely for anyone to figure out on their own IMO.
it is possible...
I was racing a friend (who cheated!!!) and beat them lol with no walkthrough and only used one after to help them cus i couldnt remember everything)