The time limit did make it quite challenging. I got 1,000 points with a max streak of 8 in a row. On second playthrough I got 3,550 / 12. It seems the AI images all come from a particular area of latent space that's quite easy to recognize once you get dialled in.

So it's more of a "can you detect the GPT Image 2.5 house style", which is an easier problem.

I'd appreciate an untimed mode.

I agree, there's patterns that aren't hard to recognize if you have some experience.

I got 2400 with 10 in a row on first attempt.

Here's the entire decision matrix:

- Is the color, mood, composition, and level of detail exactly like most Nano Banana Pro images? If yes, AI.

- Is the composition/framing utterly perfect? If yes, AI.

- Is the subject ephemeral or random, like a candid photo or something otherwise unlikely to be photographed? If yes, not AI.

- Final decision, if there's any doubt, go entirely off of how centered the subject is.

I think some of this has more to do with the data set than the methodology. You could easily come up with a bunch of examples to fool me specifically, but alas, they didn't.