This is a really fun gamemode! :D I highly recommend it! Think TTT plus The Thing!
You need Garry's Mod and CSS I believe. But Richard doesn't have CSS and he could play it, some weapons and characters gave errors for him, but it works. :)
Read about Morbus here (scroll down): http://www.facepunch.com/showthread.php?t=1092742
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Outro song: http://www.youtube.com/watch?v=IGKgXA91X5o
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