Hat tip to NotGraphs on Fangraphs
Here's the deal. It's a Sporcle. You answer questions in an allotted amount of time. That's how it works.
This one in particular graphs the careers of 20 major league players, and you have to figure out who they are just from the graphs (which do include years at the bottom, a big help).
I got 16 of 20, missing one because of a misspelled last name and another because of a wrong first name and misspelled last name. Hey, it happens, and Sporcle rarely gives you answers for free.
None of the people are obscure, many have broken records of some sort, or have had career quirks that fit the graphs. You don't have to know a ton about each individual...just enough to get the name right.
Pretty sweet one, in my esteemed opinion.