YOU SAID:

I don't want to be just a piece in their games.

INTO JAPANESE

私は彼らのゲームの一部になりたくありません。

BACK INTO ENGLISH

I don't want to be part of their game.

INTO JAPANESE

私は彼らのゲームに参加したくありません。

BACK INTO ENGLISH

I don't want to participate in their game.

INTO JAPANESE

彼らのゲームに参加したくない。

BACK INTO ENGLISH

I don't want to participate in their game.