[sequoia]

But I still couldn't figure out which ones were "checks" or "light pictures"

[throwanem]

They all are! That's the joke. They're all "checks" because you have to check a box, they're all "light pictures" because that's how a computer display works, they're all "glasses" because they all have glass of some sort in them...

[nikisweeting]

You don't have to get all the picture choices right, you just have to select all the pictures on the last two screens.