Each one who plays has a strength based on things which can change, like x, y and z. They vote to change them and in the end the high strength wins.
Take a group of things that can change, like x, y, and z.Each one who plays has points based on the way those things are used in math. The group can vote to change the things and thus your points. No one should know how your points are made, so that you can hide your goals in a change.
Play by teams, but this would not be as good since those who knew math would do all the work for their team. We could, if we did teams, have one of the things set to each one on the team, so that one would be the sole one to try to change the thing for their math.We could make the game more if one of the things that changed was a feat you could do, like a race or a leap or time spent to help cook and clean.