I had to install Happy Color on a new tablet, paid for the ad-free upgrade (which I had before) and found this no longer supports unlimited hints which shows ads. According to X-Flow, this feature was deprecated over a year ago. Now, even after paying for ads, we still get ads for hints only. These are intrusive as well as interrupting. A user commented about ads and X-Flow told the user the ads were removed when upgraded. This is not entirely true and misleading.