Thinking With Time Machine what can I say about this mod. This is a very well polished mod from what I have seen and has obviously it is popular otherwise it would not have been released stand-alone.
The story is very minimal basically at the beginning of the game you are treated by the ending cutscene of Portal 2 and then you find out you have been tricked and find out the cornfield is actually a lot of monitors put together to make you think you escaped when really you didn't which is a nice plot twist for the ending of Portal 2 after that yu are going through chambers and find GLADOS supposedly dead and Atlus and P-Body are talking about how Chell is doing the time machine course and that is basically where the story ends.
However the mod brings a very interesting and new mechanic to Portal the time machine where you create another Chell and use that other Chell to complete the chambers that look like they can only be done in Co-Op other than the gameplay and most easy chambers and some very difficult Thinking With Time Machine is a very polished refined mod for Portal 2 with interesting new mechanics to add to your experience.
If you wanted more after Portal 2 this is a good place to start besides its free and you don't need Portal 2 to run it so download it its really fun. Although its short this is a free 2 hours of entertainment for one night or evening.
Thinking With Time Machine: 7/10