I wrote a tic-tac-toe program in BF.
BF's purpose is that it's the smallest known Turing-complete language (or rather, it's possible to write a compiler for it in the fewest amount of lines).
Well, the fun part about it I found was writing a Perl brainfuck interpreter, and then using that as a basis for a completely new language. You may have heard of it - I believe it's called
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Name:
Anonymous2006-11-28 20:28
Sorry, but programming for the Atari 2600 is worse than Brainfuck.