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even though it's well known and regularly appears on hn, international obfuscated c code contest still needs to be mentioned here.
https://www.ioccc.org/
The idea was briefly kept alive in the form of the Underhanded Rust Contest[0], announced in 2016, but there were some practical problems organising it, according to an attempt in 2019 to revive it again.[1]
[0] https://blog.rust-lang.org/2016/12/15/Underhanded-Rust.html
[1] https://github.com/rust-community/team/issues/256
There have been a couple of underhanded solidity contests (smart contracts on ETH), inspired by this.
https://underhanded.soliditylang.org/
Nice to people constantly putting the code examples to good use in real projects.