House rules keep the code clean. They are not rules of the game; they are rules of how the game is built, so it never turns back into one tangled file.
4 of 4 house rules hold
✓The referee never touches the screen, the clock, the network or unseeded random
✓Each referee folder only uses the folders below it
✓No code file is longer than 400 lines
✓The game screen reaches the referee only through referee.js
✓The code is neatly formatted (checked before the tests run)