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The classic resource for this (does the same sort of tricks, taken to an extreme: code overlaid with tables, tables overlaid with other tables, etc.):

http://www.muppetlabs.com/~breadbox/software/tiny/

(62-byte hello world among other things)

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how about 45 bytes...

http://www.muppetlabs.com/~breadbox/software/tiny/teensy.htm...

Indeed, except that one doesn't print "Hello world". :)

Oh, right, you got me, I totally didn't remember that, only the fact, that it was really small and I dug the fact that he put it inside the header.

How about 31 bytes?

http://www.returninfinity.com/baremetal-helloworld.html

Why use ELF or Linux? Flat binaries (and a custom OS) to the rescue! :)

Why limit yourself to an OS? Design your own instruction set, with a single-bit 'hw' instruction!

As with all games (even Nomic) a game is only a game if there are rules that limit what one can do.

The esoteric language HQ9+ does this.

Many years ago I used to have a 58-byte version, but around the time that x86-64 was being developed, Linux started examining (and thus validating) a couple more fields in the ELF header. It's really a shame, because the corner-cutting in the 62-byte version isn't nearly as impressive (in my own opinion).

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