Rule 1: Use only the most gratingly obvious 8-bit sound effects, Rule 2: Never underestimate the power of a well-placed kazoo, Rule 3: Chiptune prophets have 3 rules for every occasion, apparently
Rule 4: A chiptune should never be too complex, unless it's a puzzle, then it can be as complex as you like, Rule 5: Never use a chiptune that's not a palindrome, it's just not worth it
Chiptune Chao: Because who needs music when you can have 8-bit noise?