Make sure to keep an eye on your multiplier. If you don't pick up tags fast enough it will reset and make it very hard to keep your score up.

The best time to go pap a gun is during a time freeze drop you will not lose score or multiplier and zombie blood as long as you have plenty of points.

Make sure you do not pap a gun if you have less than 10k points, when you use your points the bar will go down and make you closer to blowing up if your points reach 0.

Taking damage will take away from your multiplier bar and points so try to avoid damage while making sure to be constantly picking up tags.

Focus your attention to the first mangler that spawns in to kill quick, I like to save my rags for the second wave of manglers it spawns 2 or 3 and i usually dont have pap by then.

The best way I have found for a good start is to just kill with the wall gun you spawn with until around 10k points and try to pap it on either a time freeze drop or zombie blood. If i pap on zombie blood i make sure to kill a couple zombies that jump out of the pap window before i put the gun into pap so i have a couple tags to grab so my multiplier doesn't run out. Once i get another 15-20k points and another drop that lets me pap easily i will try to get an AAT on the gun and then from there its killing and box hitting. Have fun and enjoy the map it is not easy but the more you play it the better you will get.