I played some visual games with my roommates, Greg and Sean.
With Greg, I played
"The Band Cross". The objective was to determine which color of "snake" was the shortest.
I followed the path of each color of snake from one end to the other, marking the pathway with a symbol (different for each color) every time the distance of a semicircle was covered. Amount of symbols is totaled to determine the length of each snake.

Greg looked at each circle individually. A number is written down for each circle, representing how many times a certain color of snake makes a quarter rotation around that circle. The numbers are totaled to determine the length of each snake.
With Sean, I played
"Three Squares". The objective was to trace a path along the image without intersecting your lines.

I started at the bottom right corner, worked my way around the outside to the top left corner then attempted to keep my lines as close as possible to my previous lines by "zig-zagging", or crossing back and forth across the image.

Sean just started drawing lines, i don't think he ever successfully completed the puzzle.