All were ridiculously easy.
They artificially increased the "difficulty" (using that word loosely) by not giving you anything to judge the scale with in some pictures. Others by having ridiculous low resolution. You spot a cat-like blob of grainy pixels and then the next pic highlights the cat-like blob of grainy pixels. Just stupid.
Regardless, it was super-easy. I can't believe this ever got posted on any website, or re-posted onto this forum. Waste of time unless you were looking for a "challenge" to mock.