• Important skill points
1. Gun Expert - Max this skill first because weapon handling is the first thing you would think since you know guns? and basically killing perfect for a bloody massacre this kill of the week.
2. Money Finder - You need loads of money for buying things like perks/opening doors/upgrades and weapons.
3. Lucky Bastard - This comes really handy when you get to a tight spot and more perk drops would change the tide of battle.
4. Runner (optional) - Running alot is essential but make sure you lvl up those 3 first.
5. Sponsor (optional) - More money right from the start woudn't hurt.
(i'm not really a fan of the handyman skill but it's all up to you if you want to put points in it.)

Note: You don't actually need to max the skills 2-5

On getting perks it depends on what your preference is but this i recommend.
• Single Player perks
1. XPL- Bullets - Explosive rounds what more do you want ? i'd suggest that you'd get this one.
2. Golden Bullets - Extra piercing on every weapon well i'd be greatful for extra damage.
3. Regeneration - Moving around with a lot of enemies is a hassle but getting this is a solution to your problem.

• Multi-Player perks
Same as the single player perks, but you can suggest your friends to have different perks or just have the best perks in the game.

• BOTS
When playing alone, you have to get all 3 bots on your side to reach higher rounds they are very reliable but sometimes just a pain as well but overall they are necessary.

But how can I have bots you ask? Well the game probably already told you when you got a mobile device in the hospital all that's left is for you to get them. There's one mobile device on every map just unlock the maps and find them. You could just grind/level up at the hospital first and then unlock the other maps when you have enough ZKW.

• Weaponry
Just get whatever you like but my personal preference is a D.O.M. since it helped me out and it's very fun in multiplayer.

• Weapon Customization
Depends on your personal preference. just do what you want lol

• Accessories
Same as what i said in the weaponry just get what you think you should have and you would be okay.

Note: Don't forget to equip player perks see it on the perks section

There's nothing much i can say really, just get one who puts skill points into handyman and everything will come in handy so.....grab some friends and do the rest of the guide lol.

* Round one to five
You can use your katana till then it saves up bullets plus with bots or friends they will be the one shooting.
* Round six - etc.
On round six or midway 5 you can use your pistol since it's almost round 7 the doors will open by themselves and yeah you don't really have to wait till round 7 but it saves you alot of money if you do that.

After that you'd be out of ammo and you should get another weapon on the other door that opened or you opened there should be a gun next to there buy that and you can probably go on to a couple of rounds until a boss fight.

• After the boss fight
Defeating the boss should drop a permanent powerup, but I suggest getting the incendiary bullet or the split bullet since this would help you get to a lot of rounds and if the boss doesn't drop this kind of perk you can just get that one and wait for another boss until you get that kind of perk. I suggest not to get another perk after that because those are (what I believe) the strongest powerups in the game (especially when you have the XPL-bullets perk with you). While collecting/farming for money just buy another gun so you can fend off until the upper rounds.

• Upper rounds
and finally the upper rounds from this point on, you should probably buy the best weapon in the map like the minigun for example upgrade that and then go to a random powerup machine, then buy a secondary weapon near from there since you need a lot of ammo, upgrade that and just keep buying that gun when you need ammo now that you're all set you should just stay near the random powerup machine and buy perks when you need it until you get to 50+ rounds or even higher then rinse and repeat. While doing that don't forget keep farming/grinding for money so you can buy anytime.Have fun wasting time by killing zombies! Disclamer: These are just my tips so you can do what the hell you want lol...... enjoy killing zombies.