Difficulty

Each difficulty has different zombie spawn rates and rewards. [Plz add to this, not accurate so you're welcome to edit] 

Easy

Reward:100$ - 175$

Infected Chance:20%

Start Infects:2 - 4

Medium

Reward:200$ - 275$

Infected Chance: 30%

Start Infects: 4 - 6

Hard

Reward:300$ - 375$

Infected Chance: 40%

Start Infects: 6 - 8

EXTREME

Reward:400$ - 500$

Infected Chance: 50%

Start Infects: 8 -10

Special Cases

King Cake:EXTREME (Always)

Reward:Varies

CTF:EXTREME (Always)

Infected Chance: 60%

Start Infects:8-10

Reward:470$ - 500$

SBF, FFA, and MMA:Unknown (Always)

Reward:0$ -100$

Mixed Gamemodes

Trivia

The smaller the server, the more likely you will become an infected.

The harder the difficulty, the more likely players will spawn as special infected.

Place hasn't decreased the spawn rate of smokers ever since the Winter Games so spawning as a smoker is likely.

Crawlers spawn more in layby no matter what difficulty it is