Step 1. Start a custom game *easy or normal doesn't matter*
Step 2. Jump down the hole and chalk the 870,Get to 2 zombies left, Free Leroy, open the stairs in the back of general store and bank, Jump from bank to Gunsmith and chalk both places near jail, then get the 3rd chalk out of Gunsmith and go into barn, go to the bottom of barn and use the tunnel to get to salon, chalk top of saloon and jump to power, turn power on and buy candy.
Step 3. Roll the box for Time bombs. Use the candy to make Leroy change a roll *To do that give him candy after the boxes gives you something you don't want*
Step 4. Throw a time bomb and make sure your still on round 1.
Step 5. Invite friends. let them get points why you open doors and clear areas with Leroy. Make sure they know perks and weapons will not follow them through the time bomb.
Step 6. When they get anywhere between 25,000-30,000 points detonate the time bomb.
Step 7. After the time bomb goes off you will be back at round one with 2 zombies, the other player(s) will have all of their points but only have the M1911. Now they can roll the box for a Ray Gun Mark II.
Step 8. If you the player who threw the time bomb have any money left buy a weapon or if you got one before the time bomb use that and move through witches house. Make sure other player stay behind you so they don't lose to much money. Once through the house run straight for PaP. Player with money PaP there weapons then end the game and get them to do it for you.

If you don't understand something in this guide please telling me i am typing this after little sleep =D