I had (what I think) is a good idea;
A stats plugin that records the number of zombies killed to a database (per-day and total), then generates a ingame message and a web signature showing something like...
PlayerName has killed 341 Zombies today!
58,412 Total!
How many have you killed?
I don't think it would be hard to do, I'd do it myself if I knew more about sourcemod/database coding.
I might take a look at some of the ranks plugins and see if I cant get something working later this week.
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