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You can always challenge yourself to create "something" in 32 bytes or 16 bytes. That is soo small, that sounds and graphics are rather abstract and it comes downto: does it produce something not random, noticable. For example, here is a paint program in 16 bytes : https://www.pouet.net/prod.php?which=62025 (the objective would be : create a program that allows painting on a canvas with the mouse) There have been ASM competitions with clear objectives in the past (http://www.hugi.scene.org/compo/) but these are long gone and seem to be replace with something like https://codegolf.stackexchange.com/ now

The International Obfuscated C Code Contest

https://www.ioccc.org/

But people vote right? What quantitative metric could be possibly used to determine the most obfuscated C code?

codegolf

The Advent of Code challenges are really interesting as well, you can often code golf those by a lot. I never get that far though :/.

But, what I did last year was visualize one of the assignments; the assignment was something about overlapping areas on a field, the naive solution (for me) was to create an x by y bitmap and just add the overlaps, which could then easily be converted into a visible image, which helped me with visualizing the problem and my solution.

accounting