Antichamber -- apparently this minimalist game "messes" with your brain (!)
https://www.humblebundle.com/store/antichamber
For some reason the description makes my brain think of the words "PLUGH" and "XYZZY" (https://software.intel.com/en-us/blogs/2007/08/22/you-are-in-a-maze-of-twisty-little-passages-all-alike/). :P
https://www.youtube.com/watch?v=aGsnm2nOnso [trailer is from 2013, so I am guessing all of you heard of this at least, and maybe played it?]
in a word, yes (http://forums.righteouswrath.com/index.php/topic,9682.msg73482.html#msg73482)
I didn't bother finishing it, the last puzzle was tedious and the game glitched just before I completed it so I moved on
It's a great experience though, it really plays with what you can do in a virtual space and makes you think a little differently, worth the $5