It is crucial to us and to the protection of your channel that all sponsorship guidelines are respected. Especially when it comes to disclosing sponsorships to your community we expect you to adhere to all FTC guidelines, and to any local guidelines in your country.
You can inform yourself about all guidelines here:
Be transparent with your audience and never try to hide the fact that a video is sponsored. Disclose both orally at the beginning of your video and in writing in the description box that you are being sponsored by the publisher of a game. In livestream titles or in social media posts on Facebook, Twitter or Instagram feel free to add tags such as #sponsored or #ad.