I work at the Canadian Intellectual Property Office. Here are the applicable Canadian Laws on Patents as they refer to games:
According to Canadian Patent laws:
A method for playing a game with a gaming apparatus or article is only patentable when the apparatus or article is new and inventive, or the apparatus or article is being used for a new and non-analogous use.
A new arrangement of printed or design matter may form the subject matter of a patent if it performs a mechanical function or purpose in consequence of use 58. [...] If the novelty lies solely in the meaning of the printed words or the aesthetic appeal of the printed or design
matter, it is not considered patentable subject matter. Such matter is also referred to as nonfunctional descriptive matter.
A method of playing a board game or a game involving cards is considered to be patentable subject matter if the game board or cards are themselves novel and inventive. This can occur if the board or cards bear a new arrangement or design that provides some inventive functional use.
So, new rules for using the same thing are *not* patentable.
According to Canadian Patent laws:
A method for playing a game with a gaming apparatus or article is only patentable when the apparatus or article is new and inventive, or the apparatus or article is being used for a new and non-analogous use.
A new arrangement of printed or design matter may form the subject matter of a patent if it performs a mechanical function or purpose in consequence of use 58. [...] If the novelty lies solely in the meaning of the printed words or the aesthetic appeal of the printed or design
matter, it is not considered patentable subject matter. Such matter is also referred to as nonfunctional descriptive matter.
A method of playing a board game or a game involving cards is considered to be patentable subject matter if the game board or cards are themselves novel and inventive. This can occur if the board or cards bear a new arrangement or design that provides some inventive functional use.
So, new rules for using the same thing are *not* patentable.