Advertising is how we support the development and delivery of the free version of Pyramid.
If you prefer to play our game without ads, we also offer a paid version of Pyramid for $4.99 with no advertising. You can download the paid version here - https://itunes.apple.com/us/app/pyramid/id284475953?mt=8
The free version will not be overwritten or removed as it is a separate application.
Just note that if you do purchase it for $4.99, that the statistics are not be transferred over to the paid version as Apple treats every application independently, so you will start off fresh.