Please follow the following steps to 'Ads-free' version:

1. Access to the app.
2. Click the + (plus) sign which is on the upper right side of the screen. (next to the number of coins)
3. Click 'Show more' to see more items.
4. Buy anything you want! If you want to buy an ad-free version, please buy ‘Remove Pop-up Ads’.

Hope it helps.😊