What techniques for making my code more compact and less maintainable have I overlooked?

Without rewriting your second example:

• Use nonsensical variable names or variable names which differ only by one character or use variable names with lots of "O", "0", "l" or "1".
• Put the whole program on one single line.
• Then add random "cr/lf" at inappropriate places and, to annoy the snake-lovers, add random indents.