Mr. Yusuke Endoh (https://github.com/mame)'s entry to the 2012 IOCCC competition was an incredible, mesmerizing fluid dynamics simulation in an 80x24 terminal.
I'm trying to deobfuscate his obfuscated code, and hopefully learn something about obfuscated C code in the process! Fortunately, Mr. Endoh has provided some information on how it works. http://www.ioccc.org/2012/endoh1/hint.html
If you're interested in the deobfuscation process, check out the GitHub history of "endoh1_deobfuscate.c"
This is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License, inherited from the IOCCC.