YOU SAID:

You have to understand and play around with the rules

INTO JAPANESE

ルールを理解し、いじる必要があります

BACK INTO ENGLISH

you need to understand the rules and play around

INTO JAPANESE

ルールを理解して遊ぶ必要がある

BACK INTO ENGLISH

you need to know the rules to play

INTO JAPANESE

遊ぶにはルールを知る必要がある

BACK INTO ENGLISH

you need to know the rules to play