I just talked to my business partner (who knows more about the legal side of this stuff than I do), and here's the distinction:
You can not, by law, require a person to buy a product for a contest entry.
However, you can hold tournaments for those people who already own said product.
The manufacturer (in this case WorldWorks Games) can absolutely hold a tournament (even a contest) where the entrants are judged on a skill that's related to the product.
There is no random drawing. The law is based on chance, not skill.
Unless Canadian law is drastically different from American law, this should still hold true.
