Does anyone here know the HL code? I may know how to make blood appear on walls and stuff, but I just need a coder to help me out. PM me if you can help me. Thanks.

If you're planning on putting that to DoD, it needs to be done to client.dll. And what happens when you change client.dll? "Client.dll differs from that of the server's." or VAC or any other anticheat program will think the modified client.dll is a hack. :p