20 Mind-Bending Optical Illusions That Will Make You Question Whether Your Mind Is Playing Tricks On You

How is the cowboys chin a ‘2’?

13 doesn't really give enough information to imply that the shape must be self supporting which is what seems to be meant by "stacked" - the answer needs to be "at least 9" as there could be more cubes we can't see, but there need to 3 extra cubes to the 6 we can see to support that shape.

"the appearance of white circles even though no actual circles are drawn" if it looks like a white circle, it's a white circle. What, d'you need a line around it? What are you, eight? And the numbers one is a big pile of steaming bull, four isn't written like that and 2 certainly isn't either. A third of this was annoying trickery, a third was "yeah these things are the same", the final third was mildly interesting.

it's disappointing that many of these questions were not formed properly to be accurate. The answer they were going for was always the "correct" answer. Enjoyed it anyway though.

The elephant has one leg, the rest are random lines going nowhere or leg shapes drawn into the wrong areas.