There's just this one rule to follow: you must not use the same weapon twice in a row. If you used the Super Sheep the turn before, please use another weapon for example.
Cow handling: If you kill any enemy worms by breaking this rule, kill the same number of yours; if not, just skip your turn (and don't use the same weapon right after, because Skip Go is not a weapon!). If the cow wins you the game, then it's an automatic loss for you.
Feel free to use any WMDB or TUS map for this tournament.