"Quantum Conundrum was extremely fun to play through and took me quite some time. I have heard others have gotten through it in a couple hours, but it took me at least six. Many people compare it to Portal for obvious reasons, and I did the same. Although not quite as good as Portal 2 in some aspects, it is just as good in others. It kept me thinking throughout. Some puzzles took me some time to figure out, and then gave me the big uh-huh moment I came to love with Portal."