All the ads that appear between levels should be skippable after a few seconds. If you are having a problem with a particular ad, we would appreciate you reporting it, using the "Chat with us" button at the bottom of this page. It would be even more helpful if you can include the name or a screenshot of the ad. This will help us to track down the ad and remove it from the game.
Note that rewarded video ads that allow players to collect a reward (more coins, extra spins, etc) are not skippable.