Cash

Cash can be obtained through several ways that are listed below.
-Killing Zombies(Differentiated)

-Winning in Regular Rounds(SRV, ELI, INF, CTF)

-Obtaining Chests(Through bosses)

-Winning in Special Gamemodes(FFA, MMA, etc.)

You can also buy cash by buying it with robux, as seen in the GUI in the menu.