Answer: Yes, clicking adds/popups like the one in the image could cause your computer/electronic to catch viruses/malware.
Explanation: The cause to this is when you click an ad/popup you're exposing yourself to a potential dangerous/visious site. You're unaware to where the popup could bring you, and for all we know it could bring us to a fake site for a download which is really a visious malware to be downloaded to your device.
2D games are games that are made in the second dimension. These games are can be any type of game from platforms like Mario or adventure games like Terraria. These games are big in the mobile games market because they are simple due to them only having 2 dimensions. This makes it easy for the players because you either have to use a "joystick" to move the characters like in Terraria or push a button to do a certain action.<span />