Step 1: First 30 rounds - The first 30 rounds are quite boring so you will sadly have to get used to that, but the first 30 rounds are where you prepare for later! You should stay in the first room until round 8 or 9 (if it's way too hard, stay until round 5-6)! (Use the MP5K if needed), this is how you will grind your first points. Then at 10 get all your perks, the ray gun and the MG-42 (YOU ARE GOING TO NEED THE RAY GUN A LOT)! Then stay at the box strat until 20. You can do this by hiding behind the box and shooting the killers when they are all in a pack! Use the fire sales that they drop to get monkey bombs early. Once you made it to round 20, Pack-A-Punch yours guns, came back to the Mystery Box until round 30.

Step 2: 30+ Rounds - There are multiple ways you can get your 100 rounds.

Strat 1: Mystery Box - If you'd like you can use the mystery box until 100. Note, you will have to wrap around jeff room for ammo!

Strat 2: Checkpoint - By far the most popular strat, Checkpoint. it is a vented room located near Juggernog spawn but do not go down there, stay in the glass room with the vent behind the plant! This is usable for any round, including 100+!

Strat 3: Right hallway camp - At the end of the main hallway, there are two big doors, choose the right one and stay at the end of that corridor, the killers will all come out at one barrier, this is a quick and easy way of getting 100 rounds!

Strat 4: RG 2.0 - There is an awesome glitch you can do which makes you immune to radioactive damage! Just go to where the RayGun is located and leave the game in that spot. Then rejoin back and boom, no damage from the radioactive. Note: You will have to do the whole process again if you leave the area!

Strat 5: Firetrap - In the medic room there is a firetrap, so sometimes you can use it to fire the killers! Sometimes this strategy is quite helpful!

Strat 6: Pap machine - If you stay behind the pap machine the killers will stay just in front of it and if you switch shift lock on you can kill the killers even without going to them!

Strat 7: Cleaner one - Go at the top of Cleaner one located in the sewers and shoot on killers from it! Note: This is the least known and the hardest strat.

Now you are ready to easily get 100 rounds. Just make sure you get Juggernog, Double Tap and Quick Revive or Deadshot Dashquiri, no other perks are required!