I just got a talking ad. There was imvu in the upper left corner. The character was saying something like "Hi. My name is Amber. What's your name?" There was an animated character. It also had written "chat for free" & "create your character in3d"
I turned my sound off, so I only heard the spiel twice. Also, I don't click on ads like that (especially while doing a timed puzzle) so I don't have any more info.
Suggestion: to increase the chance of us responding to an ad, show it after the puzzle, when there is no clock running.