Blood effect
The Blood Effect option is normally disabled. To use it, select "Option", then the "Video" selection. Select "High Graphics" and set it to "Custom Preference". You can now turn on the "Blood Effect" option.
Khyber
Go to the dengbarun (whatever it is) team and when you spawn go to the staircase to you right, go to the edge of the staircase (also on the right) and lay down and go into it. You will be inside the staircase. Note: you cannot shoot out of the staircase when you are in it so when an enemy comes by, stick you head out of the staircase (from the place you entered) and then you can shoot him.
Three guns for two
Purchase the guns you want to use from the Item Shop. Go into a game then select the weapon you want to start with from your inventory, then press OK. Before you hear the voice sound "GO! GO! GO!", quickly select another gun from your inventory before the game starts, this gun will be your extra gun it can either be a pistol or rifle.
If your timing is correct you should have (three) guns instead of just two. Move your mouse scrolling wheel (up and down) during gameplay, if you don't notice any weapons show up on the game screen then you did the cheat right.
Press buttons 2 or 3 to pull out either your pistol or rifle. You can't play your third gun all the time just when you first pulled it out, you can't bring it back again unless you repeat the glitch.
Velruf
Join the green team and when you spawn, run past the bomb site next to you, past the snowman to the dumpster, then take a right at the dumpster and go up to the pile of presents. Lay down and crawl into the wall on your right when you are facing the presents, you will go in. Note: You will not be able to shoot out unless you have at least your head out of the wall.