Ignore the topic name.
I'll keep it short and simple: Invent a game/sport
Example: Calvin and hobbes: Calvin ball
Now for mines
(You don't have to set it up this way, I'm just being neat)
Name: Blinded mayhem.
Tools: Blind folds, Nerf bats, Mud, Nude, Ping pong balls, Hiiglighters.
Rules: Choose a judge.
The judge chooses how you fight. But You have to have use the tools
Rules depend on what the judge says so the game is always different.