In addition to the rules outlined in our Terms of Use:

Rights and Ownership

You must be the creator and owner of the game you are submitting.

You must have rights to the music in your game, or be using music that grants rights freely. Your favorite song from the radio can't be played here.

Your game must not be a modified version of someone else's work, including tutorial files.

Your game must not use Angry Birds or Super Mario Bros. characters/sprites. In general you shouldn't be using any sprites you don't have full rights to.

Do not include copyrighted video clips or photographs that you did not create.

Adult Themes

You may not include photography or video of naked people.

You may not include photography or video images of excessive gore and/or "snuff."

Do not include illegal photography or video such as child pornography and bestiality. We WILL contact the FBI!

Sexual content involving underage characters is prohibited, please don't look for grey areas. Adding a disclaimer that all characters are 18+ or Over 18 does not get your submission around the No Grey Areas clause.

Make sure your game has been properly rated. Any nudity beyond a non-sexualized butt should fall under the A rating nowadays.

Hate Speech

Your game must not be racist or downright hateful towards specific groups of people.

Personal attacks towards other NG contributors will likely result in removal.

Other Things to Avoid

Your submission must not auto-redirect to a new site or open pop-ups. If your submission auto-spawns something to boost stats on another site, your account will be deleted and admins for the target site will be notified.

Your game must work on Newgrounds, in a web browser. If you ask users to download and install something to play your game, it will be removed. The only exception here is traditional Flash games that require NG Player to run, assuming they don't work via Ruffle emulation.

It would be best if your game does not rely on any calls to third party servers. If you are using a third party API or anything that could be used to track a user, you must give notice of this at the start of your game and give the user the option to opt out. If the user opts out, you may not give the third party any access to their session.

Your game must not be shovelware made to serve ads or promote your site. If you didn't take personal pride and care in the creation of the content, leave it off NG.

You may not upload games made in Kogama (previously Adventure Box).

Your game must not be a pointless "demo" or "preview" without any redeeming qualities.

Do not re-submit your entry after it has been BLAMMED without making noticeable improvements.