Twenty Eighth International Obfuscated C Code Contest

Twenty Eighth International Obfuscated C Code Contest

Where to start

See below for links to the 2024 winning IOCCC entries.

Check out the index.html web pages for each winning entry. They have most of the information you need to compile and run the winning program. Take a look at the winning source code and try to figure out how it works. You might also want to check out the author’s remarks for even more details.

You may download all winning entries in the form of a compressed tarball, for this year’s contest.

General remarks on this contest

This year marked the 40th anniversary of the IOCCC. The IOCCC28 opened submissions from 2025-03-05 23:19:17.131107 UTC to 2025-06-05 04:03:02.010099 UTC after a 4 year pause.

A significant portion of those 4 years was an effort by a number of people, with over 6168+ commits, to rebuild the Official IOCCC website in what became known as the Great Fork Merge.

Another portion of those 4 years went into retooling the IOCCC, including the creation of the mkiocccentry toolkit, a new IOCCC registration process, and a new IOCCC submit server (which may not be up if the contest is closed).

The major motivation for the above was to:

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