die Spielregel
game rule
A rule that defines the procedure and conditions of a game.
Bevor wir anfangen, musst du mir die Spielregeln erklären.
Before we start, you have to explain the game rules to me.

game rule
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game rule
A rule that defines the procedure and conditions of a game.
Bevor wir anfangen, musst du mir die Spielregeln erklären.
Before we start, you have to explain the game rules to me.

The word is composed of 'das Spiel' (game) and 'die Regel' (rule). So it literally means a rule for a game.
Jedes Kartenspiel hat seine eigenen Spielregeln.
Every card game has its own game rules.
Common verbs used with game rules are 'erklären' (to explain), 'lernen' (to learn), 'befolgen' (to follow), or 'sich halten an' (to adhere to). When you break a rule, you 'verstößt' 'gegen die Spielregeln' (violate the game rules).
Alle Spieler müssen sich an die Spielregeln halten.
All players must follow the game rules.
You can recognize the figurative meaning from the context. When it is about social spheres such as 'Politik' (politics), 'Wirtschaft' (business/economy), or 'Berufsleben' (working life), it usually refers to unwritten behavioral norms.
Er ist neu in der Firma und muss die ungeschriebenen Spielregeln erst noch lernen.
He is new at the company and still has to learn the unwritten rules of the game.
rule / period
'die Regel' and 'die Spielregel' both refer to something that determines how one should act. 'die Regel' is more general and can fit anywhere: at home, at school, in traffic, or at work. 'die Spielregel' literally means a rule in a game. But it can also be used figuratively when talking about expected behavior in a group or situation. Learners may confuse the words because every 'Spielregel' is also a 'Regel'. But not every 'Regel' is a 'Spielregel'.

Vor der ersten Runde erklärt Lea ihrem Freund die Spielregeln.
Before the first round, Lea explains the game rules to her friend.
Die Eltern haben zu Hause die Regel, dass beim Essen keine Handys auf dem Tisch liegen.
The parents have a rule at home that no phones are allowed on the table during meals.