Anyway, the game is, there are four circles at the corners of the page, and according as you see red squares at the positions
you add them up and type the corresponding hexidecimal character.
So that above is "d" because 1 + 4 + 8 = 13.
(I don't really do the math in my head, I just trained myself to memorize which patterns go with which keys.)
A prompt of which character you're supposed to type appears after 2 seconds, which has the interesting effect of making a pronounced difference of feeling between the "flow state" where you're always getting the right answer before that timer elapses and the broken/interrupted/crash/bzzt feeling of seeing the thing you're supposed to be typing.
The goal was to see if I could get into a mental state where I wasn't sweeping my fovea around to the four corners of the screen in serial but rather absorbing the gestalt of the screen in parallel. And... once or twice it kind of felt like that, very spaced out and automatic, and felt my finger going to the right key before I felt consciously aware of what I was looking at. Pretty weird and neat.