Your ads may not be shown in the following unexpected ways for users:
Full screen interstitial ads of all formats (video, GIF, static, etc.) that show unexpectedly, typically when the user has chosen to do something else, are not allowed.
Ads that appear during game play at the beginning of a level or during the beginning of a content segment are not allowed.
Full screen video interstitial ads that appear before an app’s loading screen (splash screen) are not allowed.
Full screen interstitial ads of all formats that are not closeable after 15 seconds are not allowed. Opt-in full screen interstitials or full screen interstitials that do not interrupt users in their actions (for example, after the score screen in a game app) may persist more than 15 seconds.