Rule is fundamental to the operation of the forum. Because CS.RIN.RU is an international community, it enforces a strict language policy to ensure that all discussions remain accessible to the widest possible audience and are manageable for the moderation team. Rule Title: Use English only

If you are currently attempting to sign up, you likely encountered this as a verification question. The forum uses these "hidden" or "specific" questions because:

Always ensure you are on the official CS.RIN.RU domain when registering, as third-party mirrors may not be secure.

While § 3.3 focuses on language, other nearby rules often appear in these checks: Do not post spam or advertisements. § 3.2: No flaming or personal attacks.