In order to make a really smooth experience for you audience, you can stick your CTA buttons (game, redirection to a website, bot opening) at the bottom of the screen.
This way, the button is constantly visible at the bottom of the user's screen, which prevents users from scrolling down to the button.
To stick a button, all you need to do is to click on the button and check the Stick to bottom option in the left hand side menu:
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Here is how the button will appear:
