Way too many ads. They are not forced pop up ads, other than when you are spending money on upgrades and the next upgrade is "free" with an ad. Tapping it will lock you into a 30sec ad. Permanent banner ad on the bottom of the screen and both sides of the screen are covered with icons to either get you to spend money or more ads. Not worth the 10 dollars to remove and the gameplay isnt entertaining enough to navigate the ad field.