The rules of the game
Definition 1 of 2
Pro Tip 1/3Literal Context
Used when explaining actual instructions or steps needed to play a game or complete a task. 
Learning the rules of the game is essential before your first game of Monopoly.
Pro Tip 2/3New Activity
Mentioned when someone is unfamiliar with how something is done, often for hobbies or new tasks. 
She struggled initially, but she's learning the rules of the game quickly.
Pro Tip 3/3Clarification
Ask about 'the rules of the game' if you are unsure how to proceed with an activity or game. 
Could you explain the rules of the game? I've never played before.