Yes, there are puzzles. Most are 'exploratory' (they can be solved by just one person who does a lot of backtracking / note taking, but are easier with two) A

Yes, there are puzzles. Most are 'exploratory' (they can be solved by just one person who does a lot of backtracking / note taking, but are easier with two) A few actually require two people. (I can't remember if they are still in MOULa today, or if their one-player counterparts are live). A few are "cheat" puzzles -- they rely on the (very bad) physics engine or stupid-long wait times. (some are upwards of 20-30 minutes, some are over 24 hours). They were always bad ideas, but luckily these are few and far between. While I'm a big fan of what they were trying to accomplish, the experience is significantly less polished when compared to Portal 2. If you found Riven enjoyable, the puzzles are slightly easier and simpler. You'll probably have fun, either on your own or with a few friends.