the question is pretty easy. What is better for the clicking rate. A thumbnail for a game with an border or with none ? (On a website)
Do you have any experience with that ?
Best Regards Marcel
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From the design standpoint, the black borders look a bit out-of-date and obtrusive, so visually it's much better to have no borders. To differentiate your situation from a simple collage of ads, consider adding a couple lines of small type under each game. These could:
This will make the choices super-clear to the user, and educate his decision. I understand that most likely you have limitations in screen space, but then it's worth to make the banners a bit smaller — and have clear information architecture in place.